- Correspondence to Dr Katherine Sorsdahl, J-Block Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa;
- Accepted December 23, 2009
- First published April 28, 2010.
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.