Funding for this research was provided by:
Bill and Melinda Gates Foundation
Received: 4 May 2017
Accepted: 26 July 2017
First Online: 15 August 2017
Ethics approval and consent to participate
: This study was approved by the Medical Research Coordinating Committee of the National Institute for Medical Research, Tanzania. Informed consent both orally and in writing (in Kiswahili) was obtained from all individual participants or parents/guardians in case of children and adolescents (below 18 years).
: Not applicable.
: The authors declare that they have no competing interests.
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