Yamada, Katsuo http://orcid.org/0000-0002-5120-2150
Seki, Yukio
Nakagawa, Taku
Hayashi, Yuta
Yagi, Mitsuaki
Ogawa, Kenji
Article History
Received: 5 August 2018
Accepted: 28 October 2018
First Online: 2 November 2018
Compliance with ethical standards
:
: The authors have declared that no conflict of interest exists.