1. Unger-Vetlesen Institute Department of Medicine Lovisenberg Diaconal HospitalOslo Norway
2. Faculty of Medicine University of OsloNorway
3. Population Health and Research Institute Medical CollegeTrivandrum Kerala India
4. Thoothukudi Government Medical CollegeTuticorin Tamil Nadu India
5. Government Rajaji HospitalMadurai Tamil Nadu India
6. Institute of Health and Society Faculty of Medicine University of OsloNorway
7. Department of Gastroenterology and Hepatology Institute of Clinical Medicine Oslo University Hospital UllevålOslo Norway