Funding for this research was provided by:
National Bureau of Economic Research (25310.00.01.00.7700)
H2020 European Research Council (716458)
Received: 23 December 2020
Accepted: 14 April 2021
First Online: 26 April 2021
: At first, the interviewers called the participants to inform them about the study and obtain their consent. Thereafter, they set appointments for the phone interviews at the time suitable for the participants. To maintain confidentiality and avoid interruptions from other staff, the researchers conducted the interviews in dedicated rooms in the office. The study received ethics approval from the Tanzanian Medical Research Coordination Committee (NIMR/HQ/R.8c/Vol. I/837) and the ethics Committee of the London School of Hygiene and Tropical Medicine (Ref: 11918-3).
: The authors declare that they have no competing interests.