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Cologne Institute for Health Economics and Clinical Epidemiology, The University Hospital of Cologne (AöR), Gleueler Strasse 176–178/II, 50935 Koeln/Cologne, Germany
Cologne Institute for Health Economics and Clinical Epidemiology, The University Hospital of Cologne (AöR), Gleueler Strasse 176–178/II, 50935 Koeln/Cologne, Germany
Cologne Institute for Health Economics and Clinical Epidemiology, The University Hospital of Cologne (AöR), Gleueler Strasse 176–178/II, 50935 Koeln/Cologne, Germany
Cologne Institute for Health Economics and Clinical Epidemiology, The University Hospital of Cologne (AöR), Gleueler Strasse 176–178/II, 50935 Koeln/Cologne, Germany
Institute of General Practice, Faculty of Medicine, University of Düsseldorf, Moorenstraße 5, 40225 Düsseldorf, Germany
Cologne Institute for Health Economics and Clinical Epidemiology, The University Hospital of Cologne (AöR), Gleueler Strasse 176–178/II, 50935 Koeln/Cologne, Germany