- Correspondence to Dr J Bekhof, Princess Amalia Children's Clinic, Isala klinieken, Dr van Heesweg 2, PO Box 10400, Zwolle 8000 GK, the Netherlands;
- Received July 9, 2014
- Revised January 26, 2015
- Accepted January 30, 2015
- First published February 19, 2015.
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