Funding for this research was provided by:
University of KwaZulu-Natal, College of Health Sciences Scholarship
Received: 13 November 2018
Accepted: 31 May 2019
First Online: 11 June 2019
Ethics approval and consent to participate
: This paper is a scoping review, strictly relied on the review of existing literature. Since there were no animal or human participants in this study, ethical approval is not required.
: Not applicable.
: All authors declared that they have no competing interest.