1. Institute for Evidence in Medicine, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
2. Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nuremberg, Germany
3. Cochrane Hungary, Clinical Center of the University of Pécs, Medical School, University of Pécs, Pécs, Hungary
4. German Cancer Research Center (DKFZ), Division of Cancer Epidemiology, Heidelberg, Germany
5. Faculty of Medicine and Health and Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
6. Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
7. Primary Care Department, Azienda ULSS 3 Serenissima, Venice, Italy
8. Cochrane Germany, Cochrane Germany Foundation, Freiburg, Germany