S.G. DRUZHKIN1,2, E.V. TRISHIN1,2, L.B. SHUBIN1 1Yaroslavl State Medical University, 5 Revolyutsionnaya St., Yaroslavl, Russian Federation, 150000 2Regional Hospital, 7 Yakovlevskaya St., Yaroslavl, Russian Federation, 150062 Druzhkin S.G. — postgraduate student of the Surgery Department, tel. +7-920-655-16-22, e-mail: sermed@mail.ru Trishin E.V. — Cand. Med. Sc., Associate Professor of the Surgery Department, tel. +7-910-977-19-28, e-mail: yar-torax@rambler.ru […]