Funding for this research was provided by:
International Development Research Centre (108458)
Received: 6 December 2019
Accepted: 17 February 2020
First Online: 21 February 2020
Ethics approval and consent to participate
: The protocol complies with the Declaration of Helsinki (Fortaleza, Brazil 2013) and we received ethics Approval from the Research Committee of the Provincial Government of the Western Cape, the City of Cape Town, and the Human Research Ethics Committee, Faculty of Health Sciences, University of Cape Town (HREC 098/2016). Written informed consent was obtained from all participants.
: The authors declare that they have no competing interests.