Text and Data Mining valid from 2018-03-27
Received: 10 August 2017
Accepted: 19 March 2018
First Online: 27 March 2018
Ethics approval and consent to participate
: The study received ethical approval from the Pharma-Ethics Research Ethics Committee of South Africa (Reference number: 13095660). All participants signed informed consent prior to enrolment.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.