1. Department of Aging Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
2. Center on Aging and Mobility, University Hospital Zurich and University of Zurich, 8006 Zurich, Switzerland
3. Geriatric Service and Nursing Homes of the City of Zurich, 8050 Zurich, Switzerland
4. University Clinic for Aging Medicine, Zurich City Hospital-Waid, 8037 Zurich, Switzerland