1. Department of Rheumatology/Rehabilitation, Kliniken Valens,
Valens, Switzerland
2. Department of Geriatrics, Inselspital, Bern University Hospital,
University of Bern, Bern, Switzerland
3. Department of Therapies, Kliniken Valens, Valens,
Switzerland
4. Research Department, Rehabilitation Center Kliniken Valens, Valens,
Switzerland