1. Wolfson Institute of Population Health, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, United Kingdom (J.S., M.K.B., G.A.M., F.J.H.).
2. Resolve to Save Lives, An Initiative of Vital Strategies, New York City (L.K.C., N.I.).
3. Consultant, Washington, DC (M.F.J.).