1. Institute for Evidence in Medicine, Medical Center, University of Freiburg, Faculty of Medicine University of Freiburg Freiburg Germany
2. Cochrane Germany, Cochrane Germany Foundation Freiburg Germany
3. Clinic for Palliative Care, Medical Center, University of Freiburg, Faculty of Medicine University of Freiburg Freiburg Germany
4. Library of the Center of Surgery University Medical Center Freiburg Germany
5. Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center University of Freiburg Freiburg Germany