- Correspondence to Dr Vivian Black, Clinical Microbiology and Infectious Diseases, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa;
- Received November 18, 2015
- Revised April 10, 2016
- Accepted April 16, 2016
- First published May 6, 2016.
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