1. Johan Hansen ( ) is a postdoctoral senior researcher at the Netherlands Institute for Health Services Research (NIVEL), in Utrecht.
2. Peter P. Groenewegen is director of NIVEL and a professor of social and geographical aspects of health and health care at Utrecht University.
3. Wienke G. W. Boerma is a postdoctoral senior researcher at NIVEL.
4. Dionne S. Kringos is a postdoctoral senior researcher at the Academic Medical Centre of the University of Amsterdam, in the Netherlands, and a 2014–15 Harkness Fellow in Healthcare Policy and Practice at the Harvard T. H. Chan School of Public Health, in Boston, Massachusetts.