1. Academic Department of Gastroenterology Royal Hallamshire Hospital Sheffield UK
2. Gastroenterology Unit IRCCS Pavia ICS Maugeri University of Pavia Pavia Italy
3. Department of Histopathology Royal Hallamshire Hospital Sheffield UK
4. Histocompatibility and Immunogenetics Laboratory NHS Blood and Transplant Sheffield UK
5. Celiac Center Beth Israel Deaconess Medical Center Harvard Medical School Boston MA USA
6. Division of Gastroenterology, Hepatology and Nutrition Boston Children’s Hospital Harvard Medical School Boston MA USA
7. Unit of Clinical Epidemiology and Biometry IRCCS Policlinico San Matteo Pavia Italy