1. Leibniz Institute for Prevention Research and Epidemiology - BIPS GmbH; Clinical Epidemiology; Achterstrasse 30 Bremen Germany 28359
2. Pharmafacts GmbH - Research and Consulting in Drug Care; Ludwigstr. 37 Freiburg Germany 79104
3. Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg; German Cochrane Centre; Stefan-Meier-Str. 26 Freiburg Germany 79104
4. Center for Infectious Diseases and Travel Medicine, University Hospital; Department of Medicine; Hugstetter Strasse 55 Freiburg Germany D-79106