D.A. SLAVIN, A.N. CHUGUNOV, N.V. EVSTRATOVA Kazan State Medical Academy, 36 Butlerov St., Kazan, Russian Federation, 420012 Clinic of Aesthetic Medicine and Laser Technologies, 23 Telman St., Kazan, Russian Federation, 420111 Slavin D.A. — Cand. Med. Sc., Associate Professor of the Department of Endoscopy, General and Endoscopic Surgery, tel. +7-903-306-93-60, e-mail: daslavin@mail.ru Chugunov A.N. — […]