Chen, Guiying
Masuda, Akio
Konishi, Hiroyuki
Ohkawara, Bisei
Ito, Mikako
Kinoshita, Masanobu
Kiyama, Hiroshi
Matsuura, Tohru
Ohno, Kinji
Article History
Received: 23 November 2015
Accepted: 15 April 2016
First Online: 29 April 2016
Competing interests
: The authors declare no competing financial interests.