1. Department of Community Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway;
2. Department of Clinical Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway;
3. Department of Neurology, University Hospital of North Norway, Tromsø, Norway;
4. Department of Cardiology, University Hospital of North Norway, Tromsø, Norway;
5. Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway;
6. Section for Epidemiology and Social Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden