1. Department of Gastroenterology, Hepatology and Nutrition, Digestive Diseases and Surgery Institute; Cleveland Clinic, Cleveland, Ohio, United States
2. Department of Internal Medicine, Cleveland Clinic, Cleveland, Ohio, United States
3. Cleveland Clinic Alumni library, Cleveland Clinic, Cleveland, Ohio, United States
4. Department of Gastroenterology and Hepatology, University of New Mexico, Albuquerque, New Mexico, United States