1 Department of Medicine, Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
2 Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts.
3 Department of Psychology, University of Chicago, Chicago, Illinois.
4 Division of Gastroenterology and Hepatology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota.
5 Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital for Children, Boston, Massachusetts.
6 Department of Physical Medicine and Rehabilitation, Harvard Medical School, Massachusetts General Hospital, Brigham and Women's Hospital, Spaulding Rehabilitation Hospital, Boston, Massachusetts.