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Article History

Received: 13 April 2018

Accepted: 22 June 2018

First Online: 2 July 2018

Compliance with ethical standards

:

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: The authors received a research grant from MEXT 2014–2018 (no grant number). Hiromitsu Kishimoto has received a lecture fee from Asahi Kasei Pharma, Daiichi-Sankyo, Chugai Pharmaceutical, Teijin Pharma.

: Informed consent was obtained from all individual participants included in this study.