1. aHarvard University, Department of Global Health and Population, 677 Huntington Avenue, Boston, MA, 02115, United States of America (USA).
2. bUniversity of California in San Francisco, Department of Medicine & San Francisco General Hospital, San Francisco, USA.
3. cCalifornia Institute of Technology, Division of Humanities and Social Sciences, Pasadena, USA.
4. dLondon School of Hygiene & Tropical Medicine, European Centre on Health of Societies in Transition, London, England.