1. Department of Sport Science and Sport, Friedrich-Alexander-University Erlangen-Nürnberg , Erlangen , Germany
2. Institute of Sports Science, Eberhard Karls Universität Tübingen , Tübingen , Germany
3. Faculty of Medicine, Institute for Evidence in Medicine, Medical Center - University of Freiburg , Freiburg , Germany
4. Cochrane Germany Foundation , Freiburg , Germany