Thoa, Tran Thi Thanh
Minagawa, Noriko
Aigaki, Toshiro
Ito, Yoshihiro
Uzawa, Takanori
Article History
Received: 31 October 2016
Accepted: 19 January 2017
First Online: 24 February 2017
Competing interests
: The authors declare no competing financial interests.