1 Department of Health Care Management, Technical University Berlin, Berlin, Germany. Electronic address: nora.gottlieb@tu-berlin.de.
2 Department of Population Medicine and Health Services Research, School of Public Health, Bielefeld University, Germany; Department of General Practice & Health Services Research, Social Determinants, Equity & Migration Group, Heidelberg University Hospital, Heidelberg, Germany.
3 Center for Health and Migration, Vienna, Austria.
4 European Observatory on Health Systems and Policies, London School of Hygiene & Tropical Medicine, London, United Kingdom.