- Correspondence to Dr Jantina de Vries, Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa;
- Received 15 December 2011
- Revised 7 February 2012
- Accepted 28 February 2012
- Published in print 1 August 2012.
- Published online 19 July 2012.
- Published first 6 April 2012.
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