1. Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg; German Cochrane Centre; Berliner Allee 29 Freiburg Germany 79110
2. Medical Center - University of Freiburg; Center for Medical Biometry and Medical Informatics; Stefan-Meier-Str. 26 Freiburg Germany 79104
3. Martin-Luther-University Halle-Wittenberg; Institute of Health and Nursing Sciences; Magdeburger Straße 8 Halle (Saale) Germany 06112
4. Martin Luther University Halle-Wittenberg; Institute of Health and Nursing Sciences, German Center for Evidence-based Nursing; Magdeburger Strasse 8 Halle (Saale) Germany 06112