1. Division of Gastroenterology, Hepatology & Nutrition University of Utah School of Medicine Salt Lake City Utah USA
2. Department of Pathology University of Utah School of Medicine Salt Lake City Utah USA
3. Gastrointestinal Unit Massachusetts General Hospital Harvard Medical School Boston Massachusetts USA
4. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
5. Department of Pediatrics Örebro University Örebro Sweden
6. Celiac Disease Center Department of Medicine Columbia University College of Physicians and Surgeons New York New York USA