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Authors
Hayakawa, Hiroaki https://orcid.org/0000-0003-0286-3873
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Article History
Received: 12 February 2019
Revised: 7 July 2019
Accepted: 10 July 2019
First Online: 31 July 2019
Compliance with ethical standards
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: The author declares that there is no conflict of interest.
