- Correspondence to Dr Jan Maly, Department of Paediatrics, Division of Neonatology, Faculty of Medicine Charles University, University Hospital in Hradec Kralove, Hradec Kralove 500 05, Czech Republic;
- Received December 28, 2016
- Revised December 13, 2017
- Accepted December 19, 2017
- First published January 20, 2018.
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