1. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
2. Brommaplans Primary Health Care Center; Stockholm Sweden
3. Division of Gastroenterology; Massachusetts General Hospital; Boston Massachusetts
4. Harvard Medical School; Boston Massachusetts
5. Division for Family Medicine and Primary Care; Karolinska Institutet; Huddinge Sweden
6. Unit of Hepatology, Centre for Digestive Diseases; Karolinska University Hospital; Stockholm Sweden
7. Department of Medicine; Karolinska Institutet; Stockholm Sweden
8. Department of Pediatrics; Örebro University Hospital; Örebro Sweden