Funding for this research was provided by:
UBS Optimus Foundation
Bill and Melinda Gates Foundation
Received: 30 May 2019
Accepted: 30 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The study received ethics approval from the Bangladesh Medical Research Council (Reference number: BMRC/NREC/2013–2016/375, dated 14/10/2015) and the Johns Hopkins Bloomberg School of Public Health Institutional Review Board (IRB00006999). For the data from the observation study and exit interviews, subjects enrolled in the study completed written consent procedures from all participants.
: Not applicable.
: The authors declare that they have no competing interests.