1. Department Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
2. School of Medical Sciences Örebro University Örebro Sweden
3. Celiac Disease Center Department of Medicine Columbia University Medical Center New York NY USA
4. Department of Epidemiology Mailman School of Public Health Columbia University New York NY USA
5. Center for Liver Disease and Transplantation Division of Digestive and Liver Diseases Columbia University Irving Medical Center New York NY USA
6. Division of Digestive and Liver Diseases Department of Medicine Columbia University College of Physicians and Surgeons New York NY USA
7. Department of Pediatrics Örebro University HospitalÖrebro University Örebro Sweden
8. Division of Epidemiology and Public Health School of Medicine University of Nottingham Nottingham UK