1 HUNT Research Centre, Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Levanger, Norway.
2 K.G. Jebsen Center for Genetic Epidemiology, Department of Public Health and Nursing, Norwegian University of Science and Technology, Trondheim, Norway.
3 Department of Endocrinology, Clinic of Medicine, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway.
5 Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
6 Norwegian National Advisory Unit on Ageing and Health (Ageing and Health), Tønsberg, Norway.
7 Department of Medicine and Rehabilitation, Levanger Hospital, Nord-Trøndelag Hospital Trust, Levanger, Norway.
8 Clinic of Medicine, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway.
9 Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
10 Department of Health and Social Services, Trondheim Municipality, Trondheim, Norway.
11 Faculty of Nursing and Health Sciences, Nord University, Levanger, Norway.
12 Department of Geriatric Medicine, Oslo University Hospital, Oslo, Norway.
13 Faculty of Medicine, University of Oslo, Oslo, Norway.