1. Departments of 1Geriatrics
2. Centre on Aging and Mobility, University Hospital Zurich, Waid City Hospital, and University of Zurich, Zurich, Switzerland
3. Neurology, University Hospital Zurich, Zurich, Switzerland
4. Department of Biostatistics, Harvard School of Public Health, Boston, MA
5. Department of Geriatrics, University of Basel, Basel, Switzerland
6. University Clinic for Acute Geriatric Care, Waid City Hospital, Zurich, Switzerland