1. Center for Empirical Research in Economics and Behavioral Sciences (CEREB), University of Erfurt, Erfurt, Germany (CB, LK)
2. School of Business and Economics, RWTH Aachen University, Aachen, Germany (RB)
3. Department of Biobehavioral Health, Penn State University, University Park, PA, USA (COA)
4. World Health Organization, Regional Office for Europe, Copenhagen, Denmark (RB)
5. Institute for Health, Healthcare Policy, and Aging Research, Rutgers University, New Brunswick, NJ, USA (GBC)