1 Department of Health Policy and Management, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
2 Direction Generale de l'Offre de Soins, Ministere des Affaires sociales et de la Sante, 14, avenue Duquesne, Paris, France.
3 Radboud University Medical Center, Radboud Institute for Health Sciences, Scientific Center for Quality of Healthcare (IQ healthcare), Nijmegen, The Netherlands.