1. Faculty of Medicine Institute of Clinical and Preventive Medicine University of Latvia Riga Latvia
2. Alfa Institute of Gastroenterology Clinics Hospital Federal University of Minas Gerais Belo Horizonte Brazil
3. Faculty of Medicine Federal University of Minas Gerais Belo Horizonte Brazil
4. A. S. Loginov Moscow Clinical Scientific Center Moscow Russia
5. Tver State Medical University Tver Russia
6. A.I. Yevdokimov Moscow State University of Medicine and Dentistry Moscow Russia
7. Digestive Diseases Centre GASTRO Riga Latvia