1. Department of Geriatrics and Aging Research, University Hospital Zurich and University of Zurich, Zurich, Switzerland
2. Center on Aging and Mobility, University Hospital Zurich, City Hospital Waid and Triemli and University of Zurich, Zurich, Switzerland.
3. University Department of Geriatric Medicine Felix Platter, Basel, Switzerland
4. Horten Centre, University of Zurich, Zurich, Switzerland
5. Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts