- Correspondence to Emeritus Professor Imti Choonara, Academic Unit of Child Health, The Medical School, University of Nottingham, Derbyshire Children's Hospital, Uttoxeter Road, Derby DE22 3DT, UK;
- Received December 15, 2014
- Revised June 16, 2015
- Accepted June 17, 2015
- First published August 13, 2015.
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- Data supplement 1 - Online supplement
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