R. G. Avanesyan
Saint-Petersburg State Pediatric Medical University of the Ministry of Healthcare of the Russian Federation; Saint-Petersburg City Mariinsky Hospital.
Russian Federation

Avanesyan Ruben Garrievich – Cand. of Med. Sci., Associate Professor of the Department of General Surgery with the Course of Endoscopy, Saint-Petersburg State Pediatric Medical University, Surgeon of the 5th Surgical Department, Saint-Petersburg City Mariinsky Hospital. 

For correspondence:  Apt. 15, Building 82, Stachek ave., St. Petersburg, 198096, Russian Federation. Phone: +7-962-685-35-25; +7-812-985-53-25; +7-911-943-93-22. E-mail: av-ruben@yandex.ru

M. P. Korolev
Saint-Petersburg State Pediatric Medical University of the Ministry of Healthcare of the Russian Federation.
Russian Federation

Korolev Mikhail Pavlovich – Doct. of Med. Sci., Professor, Head of the Department of General Surgery with the Course of Endoscopy, Saint-Petersburg State Pediatric Medical University.

L. E. Fedotov
Saint-Petersburg State Pediatric Medical University of the Ministry of Healthcare of the Russian Federation; Saint-Petersburg City Mariinsky Hospital.
Russian Federation

Fedotov Leonid Evgenievich – Doct. of Med. Sci., Professor of the Department of General Surgery with the Course of Endoscopy, Saint-Petersburg State Pediatric Medical University, Head of the 5th Surgical Department, Saint-Petersburg City Mariinsky Hospital.

B. L. Fedotov
Saint-Petersburg State Pediatric Medical University of the Ministry of Healthcare of the Russian Federation; Saint-Petersburg City Mariinsky Hospital.
Russian Federation

Fedotov Boris Leonidovich – Postgraduate Student of the Department of General Surgery with the Course of Endoscopy, SaintPetersburg State Pediatric Medical University, Endoscopist at the Endoscopic Department, Saint-Petersburg City Mariinsky Hospital.

G. M. Lepekhin
Saint-Petersburg State Pediatric Medical University of the Ministry of Healthcare of the Russian Federation; Saint-Petersburg City Mariinsky Hospital.
Russian Federation

Lepekhin Georgiy Mikhailovich – Postgraduate Student of the Department of General Surgery with the Course of Endoscopy, Saint-Petersburg State Pediatric Medical University, Specialist for Ultrasonic Diagnostics of the Diagnostic Department, SaintPetersburg City Mariinsky Hospital.

T. V. Amirkhanyan
Saint-Petersburg State Pediatric Medical University of the Ministry of Healthcare of the Russian Federation.
Russian Federation

Amirkhanyan Tigran Valzhanovich – Postgraduate Student of the Department of General Surgery with the Course of Endoscopy, Saint-Petersburg State Pediatric Medical University.