1Association of the Scientific Medical Societies in Germany, Institute for Medical Knowledge Management, Marburg/Berlin, Germany
2Institute of Quality and Efficiency in Health Care (IQWiG), Köln, Germany
3Cochrane Germany, Freiburg, Germany; Institute for Evidence in Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Germany
4Institute for Evidence in Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Germany ; University for Continuing Education , Krems , Austria
