1. Center for Digestive Diseases; Unit of Hepatology; Karolinska University Hospital; Stockholm Sweden
2. Department of Medicine, Huddinge; Karolinska Institutet; Stockholm Sweden
3. Department of Medical and Health Sciences; Faculty of Medicine and Health Sciences; Linköping University; Linköping Sweden
4. Unit of Biostatistics; Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden