Yuval Raveh1, Tawfik Khoury2, Moshe Lachish3, Rifaat Safadi2, Yoav Kohn4. 1. Child and Adolescent Psychiatry Unit, Herzog Medical Center, Hadassah-Hebrew University School of Medicine, Jerusalem, Israel. 2. Department of Gastroenterology and Liver Diseases, Hadassah-Hebrew University Medical Center, Ein Kerem Campus, Jerusalem, Israel. 3. Department of Adolescent Psychiatry, Soroka University Medical Center and Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel. 4. Detpartment of Child and Adolescent Psychiatry, Jerusalem Mental Health Center, Eitanim Psychiatric Hospital, Hadassah-Hebrew University School of Medicine, Jerusalem, Israel.