1 École des Hautes Etudes en Santé Publique (EHESP) School of Public Health, Sorbonne Paris Cité, Paris, France.
2 Department of International Health, School of Public Health and Primary Care (CAPHRI), Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, Netherlands.
3 Centre Virchow Villermé, Sorbonne Paris Cité, Paris, France; Institute of Global Health, University of Geneva, Geneva, Switzerland.
4 Harvard School of Public Health, Harvard University, Boston, MA, USA.
5 Departments of Social and Environmental Health Research and of Population Health, London School of Hygiene & Tropical Medicine, London UK. Electronic address: andy.haines@lshtm.ac.uk.