G.T. ZAGIDULLINA, A.I. KURBANGALEEV Kazan State Medical University, 49 Butlerov Str., Kazan, Russian Federation, 420012  Zagidullina G.T. ― postgraduate student of the Department of surgical diseases, tel. +7-917-240-20-64, e-mail: [email protected] Kurbangaleev A.I. ― Cand. Med. Sc., Associate Professor of the Department of surgical diseases, tel. (843) 214-37-93, e-mail: [email protected] This article is the literature observation […]