Funding for this research was provided by:
National Research Foundation (NRF), South Africa (Incentive Funding for Rated Researchers)
Article History
Received: 2 October 2017
Accepted: 7 November 2018
First Online: 14 November 2018
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests. Prof Jacobus N Eloff is a Section Editor and Prof Lyndy J McGaw is an Associate Editor of BMC Complementary and Alternative medicine.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.