1. A.S. Loginov Moscow Clinical Scientific Center, 111123 Moscow, Russia
2. Department of Outpatient Therapy and Family Medicine, Tver State Medical University, 170100 Tver, Russia
3. Department of Propaedeutic of Internal Diseases and Gastroenterology, A.I. Yevdokimov Moscow State University of Medicine and Dentistry, 127473 Moscow, Russia
4. M.F. Vladimirsky Moscow Regional Clinical Research Institute (MONIKI), 129110 Moscow, Russia
5. Research Institute for Healthcare Organization and Medical Management of Moscow Healthcare Department, 115088 Moscow, Russia
6. Department of Internal Medicine and Gastroenterology, Omsk State Medical University, 644099 Omsk, Russia