Funding for this research was provided by:
Foundation for the National Institutes of Health (HHSN268200900033C)
Johns Hopkins Center for Global Health (n/a)
Fogarty International Center (R25TW009340)
Received: 9 February 2017
Accepted: 29 June 2017
First Online: 11 July 2017
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Johns Hopkins University in Baltimore, USA, A.B. PRISMA and Universidad Peruana Cayetano Heredia in Lima, Peru. Verbal informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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