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Authors
Toh-e, Akio https://orcid.org/0000-0002-2812-6567
Ohkusu, Misako
Shimizu, Kiminori
Ishiwada, Naruhiko
Watanabe, Akira
Kamei, Katsuhiko
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Article History
Received: 29 September 2017
Revised: 1 November 2017
Accepted: 16 November 2017
First Online: 20 November 2017
Compliance with ethical standards
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: The author(s) declare that they have no competing interests.
Free to read: This content has been made available to all.
