1. Celiac Disease Center, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA
2. Department of Medical Epidemiology and Biostatistics, Karolinska University Hospital and Karolinska Institute, Stockholm, Sweden
3. Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA
4. Department of Epidemiology, Mailman School of Public Health, Columbia University Medical Center, New York, NY, USA
5. Department of Pediatrics, Örebro University Hospital, Örebro, Sweden