1. Division of Gastroenterology and Hepatology; Department of Internal Medicine; Mayo Clinic; Rochester MN USA
2. Division of Gastroenterology; University of California San Diego; La Jolla CA USA
3. Department of Gastroenterology; St. Mark's Hospital; North West London Hospitals NHS Trust; Harrow UK
4. Division of Colorectal Surgery; Department of Surgery; Mayo Clinic; Rochester MN USA
5. Mayo Clinic Libraries; Mayo Clinic; Rochester MN USA