1. From the Center For Celiac Research, University of Maryland School of Medicine, Baltimore, MD (CC and AF); the Department of Pediatrics, Università Politecnica delle Marche, Ancona, Italy (CC, EF, and GP); the Department of Gastroenterology, Children Hospital, Palermo, Italy (GI); the University Department of Gastroenterology, Catania, Italy (CD); the University Department of Pediatrics, Bari, It