1. Department of Medicine; Celiac Disease Center, 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 Epidemiology, Mailman School of Public Health; Columbia University Medical Center; New York NY USA
4. Department of Pediatrics; Örebro University Hospital; Sweden