- Correspondence to Dr Tomohiko Nakamura, Division of Neonatology, Nagano Children's Hospital, 3100 Toyoshina, Azumino City, Nagano 399-8288, Japan;
- Received October 14, 2015
- Revised March 16, 2016
- Accepted March 18, 2016
- First published April 8, 2016.
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