About the Authors

Zheina Cherneva

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Writing – original draft

jenicherneva@yahoo.com

Affiliation Medical Institute of the Ministry of Internal Affairs, Sofia, Bulgaria

Dinko Valev

Roles Data curation, Funding acquisition, Resources

Affiliation University First Multiple Clinic for Active Treatment, Sofia, Bulgaria

Vania Youroukova

Roles Conceptualization, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing

Affiliation University Hospital for Respiratory Diseases“St. Sophia”, Sofia, Bulgaria

Radostina Cherneva

Roles Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft

Affiliation University Hospital for Respiratory Diseases“St. Sophia”, Sofia, Bulgaria

Competing Interests

The authors have declared that no competing interests exist.