1. Center for Digestive Diseases; Unit of Hepatology; Karolinska University Hospital; Institute of Medicine; Huddinge; Karolinska Institutet; Stockholm Sweden
2. Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
3. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
4. Department of Paediatrics; Örebro University Hospital; Örebro Sweden
5. Clinical Epidemiology Unit; Department of Medicine; Karolinska University Hospital and Institutet; Stockholm Sweden
6. Department of Women's and Children's Health; Division of Obstetrics and Gynaecology; Karolinska University Hospital and Institutet; Stockholm Sweden
7. Department of Medicine; Visby Hospital; Visby Sweden