Funding for this research was provided by:
Bill and Melinda Gates Foundation
Received: 6 December 2017
Accepted: 23 November 2018
First Online: 12 December 2018
Ethics approval and consent to participate
: All participants consented in writing to interview and health examination. The Ifakara Health Institute Review Board (IHI/IRB/No: 12–2013), the Medical Research Coordinating Committee of the National Institute for Medical Research (NIMR/HQ/R.8a/Vol. IX/1561) of Tanzania and the Ethics Committee of the canton of Basel of Switzerland (Ref. Nr. EK: 1612/13) gave ethical clearance.
: Not applicable.
: The authors declare that they have no competing interests.
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