1 Harvard Medical School, Boston, MA, USA; Center for Neurointestinal Health, Gastroenterology, Massachusetts General Hospital, Boston, MA 02114, USA.
2 Center for Neurointestinal Health, Gastroenterology, Massachusetts General Hospital, Boston, MA 02114, USA; Eating Disorders Clinical and Research Program, Massachusetts General Hospital, Boston, MA 02114, USA. Electronic address: hbmurray@mgh.harvard.edu.