1. Division of Hepatology, Department of Upper GI; Karolinska University Hospital; Stockholm Sweden
2. Clinical Epidemiology Unit, Department of Medicine, Solna; Karolinska Institutet; Stockholm Sweden
3. Department of Gastroenterology and Hepatology; Linköping University; Linköping Sweden
4. Department of Medical and Health Sciences; Linköping University; Linköping Sweden
5. Unit of Biostatistics, Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
6. Department of Medicine, Huddinge; Karolinska Institutet; Stockholm Sweden