P. A. Frolov
M.A. Podgorbunsky Kuzbass Clinical Hospital of Emergency Medical Care
Russian Federation

Pavel A. Frolov - Head of the Endoscopy Department No. 1.

22, N. Ostrovsky Str., Kemerovo 650991

A. G. Korotkevich
Novokuznetsk State Institute for Advanced Training of Physicians, branch of the Russian Medical Academy of Continuing Professional Education; A.A. Lutsik Novokuznetsk City Clinical Hospital No. 29
Russian Federation

Alexey G. Korotkevich - Doctor of Medical Sciences, Professor of the Department of Surgery, Endoscopy, Urology and Pediatric Surgery, Novokuznetsk SI Advanced Training of Physicians, branch of the RMA of Continuing Professional Education; Head of the Endoscopy Department, A.A. Lutsik Novokuznetsk CCH No. 29.

5, Stroiteley Ave., Novokuznetsk 654038; 49, Sovetskaya Armiya Ave., Novokuznetsk 654038