P.D. OVCHINNIKOV1,2, A.I. ANDREEV2, D.V. BOLSHAKOV2, A.G. IZMAYLOV1, R.K. MINEMULLIN2 ¹Kazan State Medical University, 39 Butlerov Str., Kazan, Russian Federation, 420012 ²City Clinical Hospital №16, 121 Gagarin Str., Kazan, Russian Federation, 420039 Ovchinnikov P.D. ― Assistant of the Department of General Surgery, surgeon, tel. (843) 222-06-53, e-mail: pavelov4innikov@icloud.com Andreev A.I. ― Cand. Med. Sc., Deputy […]