- Correspondence to Dr Catherine Mathews, Health Systems Research Unit, South African Medical Research Council, Tygerberg, 7505, South Africa;
- Received 8 October 2017
- Accepted 11 November 2017
- Published in print 29 November 2017.
- Published online 30 November 2017.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.