1. Institute for Evidence in Medicine; Faculty of Medicine and Medical Center, University of Freiburg; Freiburg Germany
2. Cochrane Germany; Cochrane Germany Foundation; Freiburg Germany
3. Institute of Medical Biometry and Statistics; Faculty of Medicine and Medical Center, University of Freiburg; Freiburg Germany
4. Cochrane Metabolic and Endocrine Disorders Group; Institute of General Practice, Medical Faculty of the Heinrich-Heine-University Düsseldorf; Düsseldorf Germany
5. Department of Geriatrics and Medical Gerontology; Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin; Berlin Germany
6. Department of Nutrition and Gerontology; German Institute of Human Nutrition Potsdam Rehbrücke; Nuthetal Germany
7. Medical University Department, Division of General Internal and Emergency Medicine; Kantonsspital Aarau; Aarau Switzerland
8. Department of Pediatrics; Paracelsus Medical University Nuernberg; Nürnberg Germany
9. Department of Health Sciences, Faculty of Science; Vrije Universiteit Amsterdam, Amsterdam Public Health Research Institute; Amsterdam Netherlands
10. Institute for Biomedicine of Aging; Friedrich-Alexander-Universität Erlangen-Nürnberg; Nürnberg Germany