1. Center for Digestive Diseases, Division of HepatologyKarolinska University HospitalStockholm Sweden
2. Department of Medicine, HuddingeKarolinska InstituteStockholm Sweden
3. Clinical Epidemiology Unit, Department of MedicineSolna, Karolinska InstituteStockholm Sweden
4. Department of Gastroenterology and Hepatology, Department of Medical and Health SciencesLinköping UniversityLinköping Sweden
5. Unit of Biostatistics, Institute of Environmental Medicine, Karolinska InstituteStockholm Sweden
6. Department of Medicine and HuddingeKarolinska InstituteStockholm Sweden