van Schalkwyk, Cari https://orcid.org/0000-0001-5154-1390
Maritz, Jean
van Zyl, Gert U.
Preiser, Wolfgang
Welte, Alex
Article History
Received: 13 August 2018
Accepted: 30 January 2019
First Online: 11 February 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Health Research Ethics Committee of Stellenbosch University with reference number N14/02/013. Need for consent to participate was waived by the Health Research Ethics Committee of Stellenbosch University.
: Not applicable.
: The authors have no competing interests to declare.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.