1. RWI — Leibniz Institute for Economic Research , Essen , Germany
2. Fresenius University of Applied Sciences, Idstein , Germany
3. Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania , USA
4. Leonard Davis Institute of Health Economics, University of Pennsylvania , Philadelphia, Pennsylvania , USA
5. Department of Population Health Sciences and Duke-Margolis Center for Health Policy, Duke VA HCS , Durham, North Carolina , USA
6. Center of Innovation to Accelerate Discovery and Practice Transformation (ADAPT), Durham Veterans Affairs Health Care System , Durham, North Carolina , USA