1 Department of Health Care Management, Berlin Centre for Health Economics Research (BerlinHECOR), Technische Universität Berlin, Str. des 17. Juni 135, 10623, Berlin, Germany. natalie.baier@tu-berlin.de.
2 City University London, Northampton Square, Clerkenwell, London, EC1V 0HB, UK.
3 Department of Health Services Management, Ludwig-Maximilians-Universität München, Schackstraße 4, 80539, Munich, Germany.