M.S. Burdyukov - Ph.D. (Med.), Senior Research Scientist, N.N. Blokhin Russian Cancer Research Center (Moscow, Russia); Associate Professor, Department of Endoscopy, Russian Medical Academy of Postgraduate Education of Russian Ministry of Healthcare M.I. Davydov - Academician of RANS, Dr.Sc. (Med.), Professor, Director of Russian Cancer Research Center of N.N. Blokhin (Moscow, Russia) A.M. Nechipay - Dr.Sc. (Med.), Professor, Head of Science Department of Endoscopy of Russian Medical Academy of Postgraduate Education of Russian Ministry of Healthcare I.N. Yurichev - Endoscopist, N.N. Blokhin Russian Cancer Research Center (Moscow); Assistant, Department of Endoscopy, Russian Medical Academy of Postgraduate Education of Russian Ministry of Healthcare B.I. Dolgushin - Member-Correspondent of Russian Academy of Sciences, Dr.Sc. (Med.), Professor, Head Diagnostic Radiology Department, N.N. Blokhin Russian Cancer Research Center (Moscow, Russia) G.V. Ungiadze - Dr.Sc. (Med.), Professor, Head of Department of Endoscopy, N.N. Blokhin Russian Cancer Research Center (Moscow, Russia)