Kurihara, Kensuke
Okura, Yusaku
Matsuo, Muneyuki
Toyota, Taro
Suzuki, Kentaro
Sugawara, Tadashi
Article History
Received: 29 December 2014
Accepted: 13 August 2015
First Online: 29 September 2015
Competing interests
: The authors declare no competing financial interests.