Qu, Wei
Tsukahara, Tatsuya
Nakamura, Ryohei
Yurino, Hideaki
Hashimoto, Shin-ichi
Tsuji, Shoji
Takeda, Hiroyuki
Morishita, Shinichi
Article History
Received: 23 July 2015
Accepted: 21 January 2016
First Online: 18 February 2016
Competing interests
: The authors declare no competing financial interests.