1. Charité—Universitätsmedizin Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Department of Geriatrics, Research Group Geriatrics, Berlin, Germany
2. Charité—Universitätsmedizin Berlin, Campus Mitte, Berlin Institute of Health, Clinical Research Unit, Germany
3. Geneva University Hospitals, Clinical Nutrition, Geneva, Switzerland
4. Marien Hospital Herne, University Hospital Ruhr-Universität Bochum, Germany
5. Department of Nutrition and Gerontology, German Institute of Human Nutrition Potsdam-Rehbrücke, Nuthetal, Germany