1. Medical Center, Faculty of Medicine, University of Freiburg; Institute for Evidence in Medicine (for Cochrane Germany Foundation); Breisacher Str. 153 Freiburg Germany 79110
2. Parc de Salut Mar; Department of Geriatrics; Carrer Llull, 410 Barcelona Spain 08019
3. Hospital de la Santa Creu i Sant Pau; Physical Medicine and Rehabilitation (MFRHB); Carrer Sant Antoni Maria Claret, 167 Barcelona Barcelona Spain 08025
4. Martin Luther University Halle-Wittenberg; Institute of Health and Nursing Sciences; Magdeburger Straße 8 Halle (Saale) Germany 06112