1. National Institute of Public Health, University of Southern Denmark, Copenhagen K, Denmark
2. Department of Medicine 2, Geriatric Section, Holbæk University Hospital, Holbæk, Denmark
3. Department of Clinical Research and Physical Medicine and Rehabilitation Research – Copenhagen (PMR-C), Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
4. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark