1. Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
2. Center of Public Health Sciences, University of Iceland, Reykjavík, Iceland
3. Unit of Integrative Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
4. Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, Michigan, USA
5. Unit of Hepatology, Department of Upper GI Diseases, Karolinska University Hospital, Stockholm, Sweden