Funding for this research was provided by:
Bill and Melinda Gates Foundation (INDIE OPP1173572)
Received: 28 November 2019
Accepted: 26 February 2020
First Online: 6 March 2020
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the National Research Ethical Review Committee (3.10|016\20), Institutional Ethical Review Board of the College of Natural and Computational Sciences of Addis Ababa University, Addis Ababa, Ethiopia, the Observational/Interventions Research Ethics Committee of the London School of Hygiene and Tropical Medicine (15811), London, UK, and AHRI/ALERT Ethics Review Committee, Addis Ababa, Ethiopia (Ref.No.SOM/DRERC/BCH005/2009, PO24/17). All participants provided written informed consent; parent/legal guardians provided consent for participants younger than 18 years.
: Not applicable.
: The authors declare that they have no competing interests.