About the Authors
The Carter Center, Atlanta, Georgia, United States of America
Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom
The Carter Center, Juba, Southern Sudan
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JDK JN GG BL SB PME. Performed the experiments: JDK JN GG BL PME. Analyzed the data: JDK. Wrote the paper: JDK. Supervised the data analysis, developed Figure 1, and contributed to the editing of the paper: JN. Contributed to the editing of the paper: GG BL SB. Supervised the experiments and contributed greatly to the editing of the paper: PME.