1. Departments of Medical and Surgical Sciences and Digestive System, Centro di Ricerca Biomedica Applicata (C.R.B.A.), University of Bologna, St. Orsola-Malpighi Hospital, Bologna, Italy
2. Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, USA
3. Department of Medicine, Columbia University Medical Center, New York, NY, USA
4. Celiac Disease Center, Columbia University Medical Center, New York, NY, USA
5. Institute of Human Nutrition, Columbia University Medical Center, New York, NY, USA