Published on in Vol 15, No 4 (2013): April
1 Global Disease Epidemiology and Control, International Health Department, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
2 Earth Institute, Center on Globalization and Sustainable Development, Columbia University, New York, NY, United States
3 mHealth Alliance, United Nations Foundation, Washington, DC, United States
4 Bonsaaso, Ghana, Millennium Villages Project, Manso-Nkwanta, Ghana
*these authors contributed equally