Tanaka, Yoshiaki
Okamoto, Shoji
Hashimoto, Kazuya
Takayama, Ryoichi
Harigai, Takakiyo
Adachi, Hideaki
Fujii, Eiji
Article History
Received: 3 November 2017
Accepted: 30 April 2018
First Online: 18 May 2018
Competing Interests
: The authors declare no competing interests.