Michael Knipper1, Kayvan Bozorgmehr2, Johanna Offe3, Miriam Orcutt4. 1. Institute for the History of Medicine, University Justus Liebig Giessen, 35392 Giessen, Germany. Electronic address: michael.knipper@histor.med.uni-giessen.de. 2. Department of Population Medicine and Health Services Research, School of Public Health, Bielefeld University, Bielefeld, Germany. 3. Doctors of the World Germany, Berlin, Germany. 4. Institute for Global Health, University College London, London, UK.