1. a NIVEL (Netherlands Institute for Health Services Research) , Utrecht, The Netherlands
2. b NIVEL, Utrecht, and Tranzo (Scientific Centre for Transformation in Care and Welfare), Tilburg University , Tilburg, The Netherlands
3. c Department of Social Medicine (Health Law Section) , Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands
4. d NIVEL, Utrecht and Faculty of Health, Medicine, and Life Sciences, Department of International Health , Maastricht University , Maastricht, The Netherlands