About the Authors
Epicentre, Paris, France
Médecins Sans Frontières, Paris, France
Regional Department of the Ministry of Health, Maradi, Niger
United Nations International Children Emergency Fund, Niamey, Niger
The authors have declared that no competing interests exist.
Conceived and designed the experiments: EG SS MLM SD EAA RFG. Performed the experiments: EG. Analyzed the data: EG TR RFG. Wrote the paper: EG SS TR MLM SD EAA RFG.