Okada, Yoshinori
Ando, Yasunobu
Shimizu, Ryota
Minamitani, Emi
Shiraki, Susumu
Watanabe, Satoshi
Hitosugi, Taro
Article History
Received: 26 December 2016
Accepted: 17 May 2017
First Online: 3 July 2017
Competing interests
: The authors declare no competing financial interests.