1. Division of Gastroenterology and Hepatology Mayo Clinic Rochester Minnesota USA
2. UO Gastroenterologia Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico Milano Italy
3. Department of Gastroenterology Royal North Shore Hospital and University of Sydney Sydney NSW Australia
4. Digestive Disease Center Soonchunhyang University Seoul Hospital Seoul Korea
5. Mayo Medical Library Mayo Clinic Rochester Minnesota USA
6. National Bowel Research Centre Queen Mary University of London London UK
7. Department of Gastroenterology Augusta University Augusta Georgia USA