About the Authors
Tulane School of Public Health and Tropical Medicine, New Orleans, Louisiana, United States of America
United States Agency for International Development, Washington, District of Columbia, United States of America
Futures Institute, Glastonbury, Connecticut, United States of America
Jhpiego, Dar es Salaam, Tanzania
Joint United Nations Programme on HIV/AIDS, Geneva, Switzerland
The authors have declared that no competing interests exist.
Conceived and designed the methods: JB EN CH HM. Collected the data: JB SM SF EN HM. Analyzed the data: JB EN SF SM HM CH. Contributed reagents/materials/analysis tools: JB EN SF SM HM CH. Wrote the paper: JB EN SF SM HM CH.