1 Division of Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
2 Nottingham Digestive Diseases Centre, School of Medicine, University of Nottingham, Nottingham, United Kingdom.
3 Center for Education and Practice of Biopsychosocial Care, UNC Center for Functional GI and, Motility Disorders and Drossman Gastroenterology, Chapel Hill, North Carolina.
4 Department of Gastroenterology, University Hospitals, Leuven, Belgium.
5 Division of Gastroenterology and Hepatology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.