Funding for this research was provided by:
Research Council of Norway (No: 220757)
Received: 17 September 2020
Accepted: 5 March 2021
First Online: 29 March 2021
: Ethical approval was obtained from the Ifakara Health Institute (Ref: IHI/IRB/No: 19–2013), the National Institute of Medical Research, Tanzania (Ref: NIMR/HQ/R.8a/Vol I/285) and the London School of Hygiene & Tropical Medicine (Ref: 6333). The household questionnaire was administered upon written informed consent by interviewees above 18 years of age.
: This manuscript is published with the permission of the Director-General of the National Institute of Medical Research (NIMR), Tanzania.
: The authors declare that that they have no competing interests.