1. Department of Heart Disease, Division of Cardiothoracic and Respiratory Medicine, University Hospital of North Norway, Tromsø, Norway.
2. Department of Community Medicine, University of Tromsø, Tromsø, Norway.
3. Department of Neurology, Division of Neurosciences and Orthopedics, University Hospital of North Norway, Tromsø, Norway.
4. Department of Clinical Medicine, University of Tromsø, Tromsø, Norway.
5. Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.
6. Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway.
7. Clinic for Heart Disease, St Olav’s University Hospital, Trondheim, Norway.