Figures
Abstract
Background
Vesicovaginal fistulas (VVF) are the most commonly acquired fistulas of the urinary tract, but we lack a standardized algorithm for their management. Surgery is the most commonly preferred approach to treat women with primary VVF following benign gynaecologic surgery.
Objective
To carry out a systematic review and meta-analysis on the effectiveness of operative techniques or conservative treatment for patients with postsurgical VVF. Our secondary objective was to define the surgical time and determine the types of study designs.
Methods
PubMed, Old Medline, Embase and Cochrane Central Register of Controlled Trials were used as data sources. This systematic review was modelled on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement, including a registration number (CRD42012002097).
Results
We reviewed 282 full text articles to identify 124 studies for inclusion. In all, 1379/1430 (96.4%) patients were treated surgically. Overall, the transvaginal approach was performed in the majority of patients (39%), followed by a transabdominal/transvesical route (36%), a laparoscopic/robotic approach (15%) and a combined transabdominal-transvaginal approach in 3% of cases. Success rate of conservative treatment was 92.86% (95%CI: 79.54–99.89), 97.98% in surgical cases (95% CI: 96.13–99.29) and 91.63% (95% CI: 87.68–97.03) in patients with prolonged catheter drainage followed by surgery. 79/124 studies (63.7%) provided information for the length of follow-up, but showed a poor reporting standard regarding prognosis. Complications were studied only selectively. Due to the inconsistency of these data it was impossible to analyse them collectively.
Conclusions
Although the literature is imprecise and inconsistent, existing studies indicate that operation, mainly through a transvaginal approach, is the most commonly preferred treatment strategy in females with postsurgical VVF. Our data showed no clear odds-on favorite regarding disease management as well as surgical approach and current evidence on the surgical management of VVF does not allow any accurate estimation of success and complication rates. Standardisation of the terminology is required so that VVF can be managed with a proper surgical treatment algorithm based on characteristics of the fistula.
Citation: Bodner-Adler B, Hanzal E, Pablik E, Koelbl H, Bodner K (2017) Management of vesicovaginal fistulas (VVFs) in women following benign gynaecologic surgery: A systematic review and meta-analysis. PLoS ONE 12(2): e0171554. https://doi.org/10.1371/journal.pone.0171554
Editor: Alberto G. Passi, University of Insubria, ITALY
Received: May 23, 2016; Accepted: January 22, 2017; Published: February 22, 2017
Copyright: © 2017 Bodner-Adler et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Data Availability: All relevant data are available in the manuscript.
Funding: This study was supported by the Department of General Gynaecology and Gynaecologic Oncology, Medical University Vienna.
Competing interests: The authors have declared that no competing interests exist.
Introduction
Vesicovaginal fistula (VVF) is an abnormal fistulous tract extending between the bladder and the vagina that allows the continuous involuntary discharge of urine into the vaginal vault. In addition to the medical sequelae from these fistulas, they affect physical, mental, social and sexual life of the patients [1]. In developing countries, the predominant cause of VVF is prolonged obstructed labour (97%) [1]. Conversely, in industrial countries iatrogenic injury to the urinary tract is the most common cause of VVF and the majority are consequences of benign gynaecological surgery [2]. It is estimated that 0.8 per 1000 of all hysterectomies are complicated by the development of a VVF [3]. Other causes in the developed world include malignant disease and pelvic irradiation [4]. In contrast to obstetric and irradiation fistulas, the typical postsurgical (post hysterectomy) fistula is the result of more direct and localised trauma to healthy tissue [5].
Although vesicovaginal fistulas (VVF) are the most commonly acquired fistulas of the urinary tract, we lack a standardized algorithm for their management [6]. Conservative management including prolonged bladder drainage, glue/fibrin injections, fulguration and so on is a reasonable option in cases with small, clean and non-malignant VVF [3,7]. Beside that, an operation is by far the most commonly preferred approach for affected women and the success rate varies between 75–95% with various different techniques in literature [3,8–13]. Multiple different surgical routes like Latzko repair, open transabdominal, transvaginal, laparoscopic, robotic, transurethral endoscopic with or without tissue interposition have been described [8,9,13], but no studies have compared surgical with conservative procedures and their outcomes in patients with VVFs following benign gynaecologic surgery. Furthermore, there is no general consensus regarding surgical time for a successful repair [7]. However, the evidence concerning treatment outcome with well-documented success and complication rates as well as the optimal surgical timing is lacking. To our knowledge, this is the first systematic review and meta-analysis investigating this topic. Primary outcome of interest was to review and summarize the current body of literature regarding effectiveness of disease management in patients with VVF following benign gynaecologic surgery. Our secondary objective was to define the most commonly reported time point for treatment and determine the types of study designs.
Materials and methods
This study was reported following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement [14]. Before data extraction, the protocol of this review was registered with the PROSPERO International Prospective Register of Systematic Reviews (CRD42012002097) following the PRISMA guidelines for protocols (PRISM-P) [15]. The following PICO question was defined and is shown in Fig 1.
Literature search
Literature search included 4 data sources using the retrieval systems DIMDI Classic search or OvidSp. In detail, we performed a computerised English-language Medline, Pub med, Cochrane Central Register of Controlled trials (CENTRAL) and Embase literature search using the MeSH terms *vesicovag* AND *fistul* AND (*management* OR *iatrogenic* OR *surgery* OR repair*), respectively. Our search ranged from 1947 to March 2016.
Study selection
The limits for literature search were adult human females. Studies were included if they reported on a) vesicovaginal fistula b) which occurred after a benign gynaecologic surgery c) with clearly described conservative or surgical management. In screening process we excluded studies focusing on other types of urogenital fistulas (UGF), congenital fistulas or fistulas due to malignancy/irradiation or foreign bodies. Studies dealing with obstetrical VVF or trials, which did not clearly separate outcome parameters regarding fistula cause, were also excluded. Congress proceedings of international society meetings, textbooks, and review articles did not meet the inclusion criteria. Reports including men, neonates or adolescents despite the search limits were not included. Non-English articles with English abstracts were included if they provided information not found in English-language literature.
Data extraction and study characteristics
Two investigators (BBA and KB) independently reviewed random titles and abstracts to establish reliable, reproducible inclusion criteria. All pertinent references from the manuscripts were obtained and reviewed. General characteristics were recorded from each study. Two authors (BBA and KB) independently abstracted study design, number of included patients, type or size of the VVF, different types of treatment (surgical/conservative), route and type of surgical treatment, cause of fistula and time point of surgical repair. The following outcome parameters were measured: time between fistula occurrence and repair (= surgical time), complete resolution of symptoms, success rate and treatment complications: postoperative leakage, de-novo stress incontinence, de novo urgency, urinary tract infection, number of attempts/repair, new-onset of pain/dyspareunia, recurrent VVF immediately (failure) or at any time postoperatively and long-term consequences on pelvic health including sexual function immediately or at any time after treatment. Terminology for success was inconsistent among included studies. We used terminology for success when success was either defined as “anatomical cure–fistula closed, healed or cured” or “absence of urinary loss, resolution of symptoms”. A total of 12 publications showed disagreement between the two reviewers. This was resolved by discussion with a third person (EH or HK). The findings of all relevant studies were abstracted, categorized and summarized by study design and outcomes measured. Furthermore, two of the authors (BBA and KB) independently rated the quality of the studies, using criteria from US Preventive Services Task Force and the NHS Centre for Reviews and Dissemination [16]. Studies received a poor rating if they were case reports, case series without adequate control group or comparative studies where the groups were not comparable.
Risk of bias (RoB) assessment.
Risk of bias between included studies was independently assessed and evaluated by two of the authors (BBA and KB). Due to the types of study design of included studies the Newcastle Ottowa Scale for risk of bias assessment for comparative studies was used (Table 1) [17]. This considers 3 criteria (selection of study groups, comparability of groups and ascertainment of outcome of interest) for quality assessment. Discrepancy between the review authors over the risk of bias was resolved by discussion, with involvement of a third author where necessary.
Synthesis of results
The meta-analysis was conducted on individual patient level using random-effect logistic regression models to calculate the probability of success for every type of therapy (conservative, surgical, combined) and every route and type of surgical treatment. 95% confidence intervals for the estimated proportion of successful treatments were calculated based on profile likelihood. To show the amount of heterogeneity the between trial variance τ² is presented for every model. Random- effects logistic regression models were used to manage study heterogeneity. Furthermore, calculation of the meta-analysis was also extended to random-effect logistic regression models. No odds ratios for the comparison between the different types of therapy were calculated as only 4 out of the 124 trials had a comparative study design while 120 studies reported uniform treatment for all documented patients. Therefore the differences in the outcome might be mainly influenced by the heterogeneity of the study populations. All statistical calculations were performed using the R-project for statistical computing (Version R-3.2.5) [18].
Results
We identified 2165 citations, reviewed 282 full text articles, and identified 124 studies for inclusion [1,4,8,10,13,19–137]. We excluded 1018 studies because they did not meet the inclusion criteria. The results of the search and screening procedure are presented as a PRISMA Flow Chart in Fig 2. The final analysis included 23 case reports, 95 retrospective case series, 5 comparative studies and 1 uncontrolled prospective study involving 1430 patients in all. There were no randomized controlled trials and no case-control studies. Case series contained between 2 and 110 patients. Detailed information of each included study (author, year, type of procedure and success rate) is summarized in Table 2.
Study characteristics
Fistula type was documented only in 58/124 (47%) studies. Of these, the majority of trials 35/58 (60%) dealed with simple fistulas, 21/58 (36%) with complex VVF and in a small percentage of studies (4%) complicated VVF were investigated. The majority of studies (66/124; 53%) did not comment on fistula type. Mean fistula size could not be calculated due to heterogeneity and insufficiency of data documentation. The majority of VVF occurred after a transabdominal hysterectomy (n = 943/1430; 66%), followed by vaginal hysterectomy (n = 126/1430; 9%), laparoscopic hysterectomy (n = 38/1430; 3%) and other benign gynaecologic operations (n = 72/1430; 5%). The remaining studies (17%) did not mention the type of hysterectomy causing the fistula. 46/124 (37%) studies included only patients who underwent a primary fistula repair (n = 221), 16/124 (13%) studies investigated patients who had previous attempts of fistula repair (n = 54) and 41/124 (33%) trials described a mixed collective of cases (n = 979). Remaining 21 studies (17%) did not give any information. Number of attempts varied between 1 and 3 repairs in average.
Conservative treatment: Results of individual studies
10 studies described non-surgical treatment strategies as sole treatment option. These included transvaginal injection of fibrin sealant in 1 case, Yag Laser welding in 8 patients, cystoscopic electrocoagulation/fulguration/catheter method in 11 patients, endovaginal application of cyanoacrylic glue in 3 cases, platelet rich plasma/rich fibrin glue application in 6 women, curettage of fistula tract in 3 cases and ball technique with rubber/metal ball in 18 females. Success ranged between 67%-100% and the majority consisted of small VVF (<1 cm) [22,26,37,39,44,62,76,86,112,122].
239/1430 VVF (16%) were initially managed conservatively with prolonged catheter drainage (range: 2–12 weeks). Only 19/239 (8%) VVFs resolved with catheter drainage and the remaining 220/239 (92%) VVFs underwent surgical repair.
Surgical treatment
The majority of patients were treated surgically. In all, 1379 patients were managed surgically and 97.98% (95%-CI: 96.13–99.29) were cured. The most commonly reported surgical approach was the transvaginal route (n = 534/1379; 39%), followed by a transabdominal/transvesical approach (n = 493/1379; 36%), a laparoscopic/robotic route (n = 207/1379; 15%) and a combined transabdominal-transvaginal approach in 45/1379 (3%) cases. Additionally, further various surgical techniques like transvaginal transurethral pointed electrocoagulation, transurethral suture cystorraphy, suprapubic cystotomy with gold leaf and so on were reported in 41/1379 (3%) cases. In 59/1379 (4%) VVFs the surgical route was not documented. Interposition grafts like Martius flap, Gracilis muscle, omental, peritoneal, labial fat flap or bladder mucosa autograft were used in the majority of studies (66 studies including 708 cases).
Success after treatment
107/124 (86%) studies documented a success rate after treatment, describing 87 patients being completely symptom-free, 754 being completely dry and in 406 cases fistula healed completely or was cured.
Results of each meta-analysis with logistic regression model.
Only studies which consistently evaluated treatment success were used for the meta-analysis. Success rate of conservative treatment was 92.86% (95%CI: 79.54–99.89), 97.98% in surgical cases (95% CI: 96.13–99.29) and 91.63% (95% CI: 87.68–97.03) in patients with prolonged catheter drainage followed by surgery. Success rates regarding surgical approaches were as follows: transabdominal/transvescial route 97.05% (95% CI: 94.55–99.18), transvaginal route 93.82% (95% CI: 89.96–97.49), laparoscopic/robotic approach 98.87% (95% CI: 96.85–99.99) and combined transabdominal/transvaginal route 90.70% (95% CI: 64.63–99.87). Use of interposition flap showed a success rate of 97.63% (95% CI: 95.31–99.22), without interposition flap reported success rate was 97.62% (95% CI: 93.63–99.91).
Reported frequency of success rates are summarised in Tables 3–8.
Intra- and postoperative surgical outcome
Successful intraoperative or postoperative outcome was mentioned in detail in 78/124 (63%) studies. The majority of these studies defined a successful outcome as an uneventful intra- or postoperative course and no immediate complications detected. 14 studies mentioned a complicated postoperative outcome and in 24 patients this was described in detail: ileus (n = 5), postoperative fever (n = 6), intraoperative bleeding (n = 2), grad II hydroureter (n = 1), clostridium difficile atelectasis (n = 1), wound infection (n = 2), bowel injuries (n = 2), compartment syndrome (n = 1), pelvic abscess (n = 1), and occurrence of ureterovaginal (n = 1) and vesicocolonic fistula (n = 2).
Length of follow-up and complication rates
79/124 (64%) studies provided information for the length of follow-up. The remaining 45 studies did not mention any length of follow-up. The mean available follow-up time was 19.7 months. Complications were studied only selectively. Total number of studies mentioning complication outcome is shown in Table 9. Due to the inconsistency of these data it was impossible to analyse them collectively.
Long-term consequences and sexual function after treatment
None of the included studies documented any long-term consequences of pelvic health. Only 3 studies assessed sexual function after treatment [41,93,135]. Dorairajan et al. reported that 8/10 patients were sexual active without any signs of dyspareunia or pain [40], Nerli et al. reported that 2/4 cases were sexual active and all 3 women were sexual active in the study published by Xu et al. [93,135].
Surgical time: Time between fistula occurrence and repair
In 22/124 (18%) studies, including 241 patients, surgery was initiated < 12 weeks after fistula occurrence. 15/124 (12%) studies with 223 patients defined the time point of surgical repair after 12 weeks. No statistically significant difference regarding success rate could be detected between early and late repair (p>0.05). 11 (9%) studies (n = 147 cases) started surgical timing < 12 weeks as well as > 12 weeks. The majority of studies (64/124; 52%), including 531 cases did not give any comment on their surgical time and 12 studies (9%) did not document an adequate time range.
Discussion
Vesicovaginal fistulas are among the most distressing complications of obstetric and gynaecologic procedures, which can cause devasting medical, social, and psychogenic consequences [138]. The aetiology has changed, becoming more associated with hysterectomy. Despite numerous publications on this subject, the management of VVF remains a source of debate. The options of fundamental issues such as the preferred surgical approach and the optimal timing of surgery still vary widely [128].
Main findings
This systematic review and meta-analysis assessed the effectiveness of disease management in patients with postsurgical fistulas and investigated treatment outcome with success and complication rates as well as surgical timing and type of study designs. The scientific literature consists mainly of case reports and retrospective case series. Furthermore, this analysis contains only a minority of studies, which used conservative treatment options as sole fistula treatment, as the majority of patients were treated surgically (96.4%). The preferred surgical approach was a transvaginal route, followed by transabdominal/transvesical approach, laparoscopic/robotic approach and combined operation techniques with reported success rates of 93.82%, 97.05%, 98.87% and 90.70%, respectively.
Comparison with literature
Treatment of patients with VVF is currently controversial [139]. Although a trial of conservative management with prolonged bladder drainage might be tried, the spontaneous closure rate of VVF is low [51]. We found only 10 studies, which used conservative treatment as sole treatment strategy. Besides, our data confirmed that VVF resolves with prolonged catheter drainage only in a low percentage (8%). Some authors indicate that conservative treatment is only successful in smallest fistulas, and the majority of patients will require definitive surgical repair [3,44,140]. However, no studies exist comparing non surgical with surgical treatment strategies.
Although an operation is by far the most common recommendation for affected women, evidence concerning surgical treatment is lacking. Multiple different surgical techniques and approaches have been described in literature [8,9,13], but the choice mainly depends on location, severity and size of fistula [141]. Additionally, only few studies have compared the surgical procedures/approaches for VVF [10,50,102,109]. One study compared open and robotic surgical repair in patients with recurrent VVFs with no significant difference in outcome and complication rate [50]. Ou et al. evaluated three different surgical techniques (laparoscopic–open abdominal–transvaginal) in patients with primary fistula repair. Their data suggested that laparoscopic repair is feasible and results in lower morbidity than transabdominal and vaginal repair [10]. Phsak et al. compared the outcome between recurrent VVFs and primary VVFs without tissue interposition. The authors concluded that transvaginal repair of recurrent VVFs without tissue interposition is equally successful as in primary repairs [102]. Rajamaheswari et al. investigated the outcome between vaginal and transabdominal repair and reported comparable success rates between the two groups [109].
Surgical approach.
The most important principle in repair is to provide tension-free, watertight closure, and the surgical route should be the one that provides the best possible chance of closure on the first attempt [142]. These principles can be achieved through a vaginal, abdominal or endoscopic approach. Although the choice of technique partly depends on the characteristics of the fistula, the surgical experience is also an important factor of successful outcome [138]. Although different surgical techniques have been described, a consensus for the ideal approach for surgical correction of VVF is still required [142].
Vaginal approach.
In general, most gynaecologic surgeons prefer the vaginal approach, which has been associated with lower morbidity rates and with an equally good outcome [7,143]. The two most commonly reported vaginal repair techniques include Latzko technique and the layered closure [143]. This systematic review confirmed that vaginal fistula repair was used in the majority of cases with a reported success rate of 93.82%. Latzko operation was performed in 170 women and Tancer et al. published the largest investigation with 110 VVFs post hysterectomy. 107 patients were treated by partial colpocleises (Latzko repair) and 89% were cured at first attempt [126]. Although the included studies are inconsistent regarding characteristics of the fistula, we summarize that the vaginal approach for fistula repair is performed in the majority of female patients and therefore it is the surgical procedure with the highest level of experience in literature.
Abdominal approach.
The abdominal route can be performed using a transvesical or an extravesical (bivalve technique) approach and is mainly indicated for loculated or complex fistulas [143]. We included 439 cases managed with an abdominal/transvesical approach with a reported success rate of 97.05%. Majority of these cases were treated with interposition graft. Due to the inconsistency of included trials and lack of fistula characteristics no recommendation can be made.
Laparoscopic and robotic-assisted approach.
Minimally invasive laparoscopic surgery is increasingly being performed, including laparoscopic VVF repair [1,10,32,36]. In 2005, Chibber et al. described a laparoscopic approach to the O`Conor technique with reported advantages of decreased morbidity and a more rapid recovery [32]. One systematic review with 44 eligible studies compared the success rates between laparoscopic/robotic transvesical repair and extravesical laparoscopic repair techniques in patients with VVF. Due to their results, the authors summarized that extravesical VVF repair has similar cure rates compared to the traditional transvesical approach [144]. Most recent technology used in the treatment of VVF repair is the robotic-assisted approach and some authors reported excellent results with this operation technique [23,30,58,98]. Disadvantages include increased learning curve, time, costs and surgeons experience. We included 8 studies, which used a robotic-assisted approach. Success rates were excellent with 100% success, but number of included patients was small. Summarizing our data, due to the small number (n = 26 cases in all) and heterogeneity of studies, no clear statement and recommendation can be made regarding this operation technique and their success and complication rate in fistula repair.
Specified long-term outcome and complication rates.
Postoperative complications are common and the most frequent postoperative complications reported in literature are de novo SUI, de novo urgency, leakage, de novo pain/dyspareunia, infection and failure [142,143]. Analysing our data, we could demonstrate that the majority of the included studies did not mention an adequate follow-up time and complications were described only selectively. We summarised 106/124 papers mentioning any complication, but from the remaining studies, which did not mention it we cannot assume that none occurred. Due to the inconsistency of these data it was impossible to analyse them collectively and no accurate prediction of complication rates can be made.
Surgical time.
One of the main controversies in literature is the ideal timing for surgical intervention for postoperative VVF. Angioli et al. recommended waiting 2–4 months using continuous drainage of the bladder [143]. However, several other studies showed that, especially for small uninfected fistulae, early repair has better or at least similar success rates compared to delayed repair with additional advantage of reduced suffering and early commencement of normal life [24,25,143]. On the other hand, some reports indicate that timing of repair does not affect the outcome [145]. Our data demonstrated that 22 publications used an early repair, 15 studies started late surgical repair and 11 trials performed early as well as late repair. Due to this inconsistency, no serious recommendation can be done regarding ideal timing for surgical intervention.
Definition success rate and fistula classification.
The reported cure rate of VVF varies between 75–95% with various different techniques in literature [3,8–13]. In accordance to literature, our findings revealed a success rate of 92.9% with conservative treatment, 97.98% in cases treated surgically and 91.63% in patients with prolonged catheter drainage followed by surgery. Summarising our data, no clear odds-on favorite regarding disease management as well as surgical approach could be identified and no technique was superior to any other. One major problem we faced was that success was defined in different ways, as many studies defined success as surgical closure of the fistula in place of function following surgery. In our opinion, successful surgical closure of the defect should be called ‘anatomical closure’ rather than ‘cure’, because many women suffer from on going pelvic organ, sexual and psychological dysfunction. Although this is of significant importance, only 3 studies [41,93,135] reported on sexual function after fistula treatment and the majority did not even mention this topic. Another problem that we faced when analysing the included studies was the lack of standardisation of terminology. The methodology of measuring the fistula as well as the used classification system was not clear in the majority of articles and none of the included studies stratified data by fistula type, primary repair versus previous attempts, fistula size or fistula location. Standardisation of the terminology is therefore required so that VVF can be properly managed [146]. Given the limitations of this analysis, future clinical research with a clearly defined VVF classification system, success definition better than anatomic result is needed to confirm our findings.
Quality and design of studies included.
The scientific literature regarding surgical or conservative management of VVF following a benign gynaecologic surgery in female patients includes mainly case reports and retrospective case series and a variety of different surgical techniques. For this reason the majority of the included studies received a poor quality rating due to the study type. Furthermore, the reporting standard regarding surgical outcome, follow-up time and complication rate was poor. In addition to differences in reporting, an adequate documented follow-up time was not mentioned in the majority of cases, making it difficult to draw meaningful conclusions from these findings.
Strengths and limitations
One of the strengths of our study is the inclusion of study data on the effectiveness of disease management in females with VVF in a specific population, namely after a benign gynaecologic surgery. The typical postsurgical fistula is the result of a direct and localised trauma to healthy tissue and therefore not comparable with obstetric or irradiation/cancer fistula. No similar analysis was found in literature. Besides, most of the included studies had the same primary outcome parameter, to be specific success after treatment. Limitations of our study are inherent to the limitations of the included studies. None of the included studies stratified data by fistula type, size or location. The methodology of measuring the fistula as well as the used classification system was not clear in the majority of articles. As no study reported data by using a unique classification system, a subgroup analysis according to fistula characteristics was not feasible. Another limitation arises from the study design as the majority of studies consisted of case reports or case series reporting uniform treatment for all documented patients. For this reason risk of bias assessment could be performed in a minority of studies with comparative study design. Furthermore, differences in outcome might be influenced by heterogeneity of study populations.
Conclusion
Although the literature on disease management of females with postsurgical VVF is imprecise and inconsistent, our data show that the majority of patients are treated surgically through a transvaginal route. The quality and design of studies reviewed were weak with a poor reporting standard, weakening the conclusions that can be drawn. In summary, these data do not allow accurate prediction of success and complication rates in female patients with VVF following benign gynaecologic surgery. Standardisation of the terminology is required so that VVF can be managed with a proper surgical treatment algorithm based on characteristics of the fistula and well designed RCT are needed in future.
Acknowledgments
We express our sincere thanks to Mag. Wildner, for her support in literature search.
Author Contributions
- Conceptualization: BBA EH KB.
- Formal analysis: BBA EP.
- Funding acquisition: HK.
- Investigation: BBA EH KB.
- Methodology: BBA EH EP KB.
- Project administration: BBA.
- Software: BBA EP.
- Supervision: HK.
- Validation: BBA KB.
- Writing – original draft: BBA.
- Writing – review & editing: BBA HK KB.
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