M.L. SHTEINER1, 2, YU.I. BIKTAGIROV2, E.A. KORYMASOV2, E.P. KRIVOSHCHEKOV2, M.YU. KHOROSHILOV2  1Samara City Hospital No. 4, Samara, Russia 2Samara State Medical University, Samara, Russia Contact details: Shteyner M.L. — MD, Associate Professor of the Department of Surgery with the course of endoscopy, physician-endoscopist Address: 125 Michurina St., Samara, Russian Federation, 443056, tel.: +7 (846) 260-33-61, e-mail: gb4@mail.ru […]