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Authors
Ohkubo, Satoshi http://orcid.org/0000-0002-2485-2561
Miyashita, Hideaki
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Article History
Received: 9 February 2017
Revised: 3 May 2017
Accepted: 15 May 2017
First Online: 16 June 2017
Competing interests
: The authors declare no conflict of interest.
