Funding for this research was provided by:
Bill and Melinda Gates Foundation (01818000165)
Received: 4 March 2019
Accepted: 23 December 2019
First Online: 13 January 2020
Ethics approval and consent to participate
: Written informed consent was obtained from study participants. The study was approved by the Institutional Review Boards of African Medical and Research Foundation, # P144/2014 and the Harvard T. H. Chan School of Public Health, # 3265–01.
: Not Applicable.
: The authors declare that they have no competing interests