N. A. Ponkratova
I.M. Sechenov First Moscow State Medical University (Sechenov University)
Russian Federation

Postgraduate Researcher, Propaedeutics of Internal Diseases Department

19991, Moscow, Pogodinskaya str., 1, building 1

P. V. Pavlov
I.M. Sechenov First Moscow State Medical University (Sechenov University)

Departmental Head, Endoscopy Department, University Clinical Hospital No.2

19991, Moscow, Pogodinskaya str., 1, building 1

O. S. Shifrin
I.M. Sechenov First Moscow State Medical University (Sechenov University)

Dr. Sci. (Med.), Prof., Propaedeutics of  Internal Diseases Department, Departmental Head, Department of Chronic Diseases of the Intestines and Pancreas, Vasilenko Clinic of the Propaedeutics of Internal Diseases, Gastroenterology and Gepatology

19991, Moscow, Pogodinskaya str., 1, building 1