Mason John B, Sanders David, Greiner Ted, Shrimpton Roger, Yukich Joshua
Tulane University School of Public Health and Tropical Medicine, New Orleans, LA 70112, USA.
School of Public Health, University of the Western Cape, Cape Town, South Africa.
Lancet Glob Health. 2016 Jan;4(1):e21. doi: 10.1016/S2214-109X(15)00246-6.