Shimada-Sugawara, Megumi
Sakai, Eiko
Okamoto, Kuniaki
Fukuda, Mitsunori
Izumi, Tetsuro
Yoshida, Noriaki
Tsukuba, Takayuki
Article History
Received: 4 December 2014
Accepted: 10 March 2015
First Online: 16 April 2015
Competing interests
: The authors declare no competing financial interests.