- Correspondence to Dr Mpiko Ntsekhe, Division of Cardiology, Department of Medicine, New Groote Schuur Hospital and University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
- Received December 31, 2012
- Revised March 7, 2013
- Accepted March 8, 2013
- First published May 16, 2013.
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