Author contribution: Milushkina OYu, Skoblina NA supervised the study; Markelova SV collected data for the study, performed statistical analysis and wrote the manuscript; Fedotov DM, Kaminer DD analyzed the literature; Ievleva OV, Savchuk PO collected data for the study.

Compliance with ethical standards: The study was approved by the Ethics Committee of Pirogov Russian National Research Medical University (Protocol No. 159 dated November 21, 2016 and Protocol No. 203 December 20, 2020). Voluntary informed consent was given by all study participants. Participation in the online survey was voluntary. The study followed the principles of biomedical ethics and did not pose any danger to the participants.