Funding for this research was provided by:
National Science Foundation (1216040)
Received: 1 August 2017
Accepted: 26 November 2017
First Online: 15 December 2017
Ethics approval and consent to participate
: Verbal consent was obtained from all participants prior to participation. Verbal consent obtained, rather than written consent, due to low literacy rates in the study population. The Washington State University Institutional Review board and Tanzania National Institute for Medical Research approved our study and consent procedures.
: Not applicable.
: The authors declare that they have no competing interests.
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