- Correspondence to Dr Sonia Lee, NICHD, Maternal Pediatric Infectious Disease Branch, 6100 Executive Blvd, Room 4B11K, Bethesda, MD 20892, USA;
- Received December 12, 2012
- Revised December 17, 2012
- Accepted December 18, 2012
- First published January 24, 2013.
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