- Correspondence to Professor Shabir A Madhi, National Institute for Communicable Diseases 1 Modderfontein Road, Sandringham, Gauteng 2131, South Africa;
- Received November 19, 2014
- Revised May 22, 2015
- Accepted May 29, 2015
- First published June 19, 2015.
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- Data supplement 1 - Online supplement
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