Zheng, Yongtai http://orcid.org/0000-0001-8906-8412
Kobayashi, Yuichiro http://orcid.org/0000-0002-9967-5520
Sekine, Tomoko
Takashima, Yoshinori http://orcid.org/0000-0002-2620-3266
Hashidzume, Akihito http://orcid.org/0000-0003-0061-3432
Yamaguchi, Hiroyasu
Harada, Akira
Article History
Received: 19 September 2017
Accepted: 5 December 2017
First Online: 8 March 2018
Competing interests
: The authors declare no competing financial interests.