1. Department of Geriatrics and Aging Research; University Hospital Zurich; Zurich Switzerland
2. Centre on Aging and Mobility; University of Zurich and City Hospital Waid; Zurich Switzerland
3. Department of Biostatistics; School of Public Health; Harvard University; Boston Massachusetts
4. U.S. Department of Agriculture Human Nutrition Research Center on Aging; Tufts University; Boston Massachusetts
5. Department of Cardiology; Triemli City Hospital; Zurich Switzerland
6. Department of Geriatrics; University of Basel; Basel Switzerland