1 Department of Health Care Management, Berlin University of Technology, Berlin, Germany.
2 University Geriatric Medicine FELIX PLATTER, Basel, Switzerland.
3 European Observatory on Health Systems and Policies, Berlin University of Technology, Berlin, Germany.
4 European Observatory on Health Systems and Policies, London School of Hygiene & Tropical Medicine, London, England.
5 German West-African Centre for Global Health and Pandemic Prevention, Chair of Planetary & Public Health, University of Bayreuth, Universitätsstrasse 30, 95447Bayreuth, Germany.