Brian E. Lacy, MD, PhDDartmouth-Hitchcock Medical Center, Division of Gastroenterology, Lebanon, NH, USA.Michael D. Crowell, PhDMayo Clinic, Department of Medicine, Division of Gastroenterology and Hepatology, Scottsdale, AZ, USA.John K. DiBaise, MDMayo Clinic, Department of Medicine, Division of Gastroenterology and Hepatology, Scottsdale, AZ, USA.