Barbara Stilwell1
, Khassoum Diallo2
, Pascal Zurn3
, Mario R Dal Poz4
, Orvill Adams5
and James Buchan6 
1Scientist, Department of Health Service Provision, World Health Organization, Geneva
2Demographer, Department of Health Service Provision, World Health Organization, Geneva
3Health Economist, Department of Health Service Provision, World Health Organization, Geneva
4Coordinator of Human Resources for Health, Department of Health Service Provision, World Health Organization, Geneva; Associate Professor and former Deputy Director, Social Medicine Institute, University of the State of Rio de Janeiro, Brazil
5Director, Department of Health Service Provision, World Health Organization, Geneva
6Professor, Faculty of Social Sciences and Health Care, Queen Margaret University College, Edinburgh, United Kingdom