Okada, Rieko
Yasuda, Yoshinari
Tsushita, Kazuyo
Wakai, Kenji
Hamajima, Nobuyuki
Matsuo, Seiichi
Article History
Received: 31 July 2014
Accepted: 2 January 2015
First Online: 15 January 2015
Competing interests
: The authors declare no competing financial interests.