About the Authors

Claudia B. M. Bijen

Affiliation Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Karin M. Vermeulen

Affiliation Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Marian J. E. Mourits

Affiliation Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Geertruida H. de Bock

g.h.de.bock@epi.umcg.nl

Affiliation Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: CB KV GdB. Wrote the paper: CB. Contributed to the study design and data interpretation: CB KV MM GdB. Checked the first draft for important intellectual content and provided many valuable comments: KV MM GdB. Approved the final version of the manuscript: CB KV MM GdB. Data collection was undertaken by: CB. Contributed to the selection and extraction of data from the included studies: CB KV.