1. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
2. Department of Pediatrics; Örebro University Hospital; Örebro Sweden
3. Division of Epidemiology and Public Health; School of Medicine; University of Nottingham; Nottingham UK
4. Celiac Disease Center; Department of Medicine; Columbia University College of Physicians and Surgeons; New York NY USA