- Correspondence to Professor Claudia Roll, Department of Neonatology and Paediatric Intensive Care, Vest Children's Hospital Datteln, University Witten-Herdecke, Dr.-Friedrich-Steiner-Str. 5, Datteln 45711, Germany;
- Received July 26, 2013
- Revised September 4, 2013
- Accepted September 6, 2013
- First published September 23, 2013.
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