Takamatsu, Masayuki
Fukase, Koichi
Oka, Ritsuko
Kitazume, Shinobu
Taniguchi, Naoyuki
Tanaka, Katsunori
Article History
Received: 22 July 2016
Accepted: 5 October 2016
First Online: 26 October 2016
Competing interests
: The authors declare no competing financial interests.