Received: 9 January 2020
Accepted: 30 April 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: Ethics approval for the study was granted by the Human Research Ethics Committee (Medical) of the University of the Witwatersrand (Clearance Certificate: M170490). Permission to access the student data was obtained from the Registrar of the University of the Witwatersrand.
: Not applicable.
: The authors declare that they have no competing interests.