1. The Norwegian National Center for Aging and Health, Vestfold Hospital Trust, Tønsberg, Norway
2. Department of Geriatric Medicine, Oslo University Hospital, Norway
3. Institute of Clinical Medicine, Campus Ahus, University of Oslo, Norway
4. Health Service Research Unit, Akershus University Hospital, Lørenskog, Norway
5. Levanger Hospital, Nord-Trøndelag Hospital Trust, Levanger, Norway
6. HUNT Research Centre, Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Levanger, Norway
7. Telemark Hospital Trust, Skien, Norway
8. Institute of Clinical Medicine, Oslo University Hospital, Oslo, Norway