I.M. SAYFUTDINOV, L.E. SLAVINA, A.F. GALIMZYANOV, S.B. SANGADZHIEV, R.R. YAKHIN, A.Z. ZAMALEYEV, A.G. PODSHIVALOV, A.M. BAYTIMIROV Interregional Clinical – Diagnostic Center, 12a Karbyshev Str., Kazan, Russian Federation, 420101 Sayfutdinov I.M. — Ph. D. (medicine), Head of the Endoscopy Department, tel. (843) 291-10-12, e-mail: isayfutdinov@mail.ru Slavin L.E. — D. Sc. (medicine), Professor, Chief Specialist in Surgery, […]