1. Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota
2. Department of Gastroenterology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
3. Division of Gastroenterology, Chulalongkorn University, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
4. Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota
5. Division of Colon and Rectal Surgery, Mayo Clinic, Rochester, Minnesota