1. Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
2. Department of Mathematics, University of Bergen, Norway
3. Department of Community Medicine, Faculty of Health Sciences, UiT–The Arctic University of Norway, Tromsø, Norway
4. Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Norway5Section for Epidemiology and Social Medicine, Sahlgrenska Academy, University of Gothenburg, Sweden
5. Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway3Department of Community Medicine, Faculty of Health Sciences, UiT–The Arctic University of Norway, Tromsø, Norway6Clinic for Heart Disease, St Olavs University Hospital, Trondheim, Norway