M.L. SHTEINER1,2, A.V. ZHESTKOV2 1Samara State Medical University, 89 Chapaevskaya St., Samara, Russian Federation 443099 2Samara State Hospital №4, 125 Michurina St., Samara, Russian Federation 443056 Shteyner M.L. —D.Med.Sc., doctor-endoscopist of theSamara State Hospital №4, Assistant of the Course of Endoscopy of the Surgery Department of the Institute of Postgraduate Education, tel. +7-927-207-71-18, e-mail:[email protected],2 Zhestkov A.V. —D. […]