From the Department of Mental Health, Department of Pathophysiology and Transplant, University of Milan, Milan, Italy; the Center for the Prevention and Diagnosis of Celiac Disease, Gastroenterology and Endoscopy Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy; and the Bipolar Disorders Clinic, Stanford University, Stanford, Calif.