Kitanaka, Taku
Nakano, Rei
Kitanaka, Nanako
Kimura, Taro
Okabayashi, Ken
Narita, Takanori
Sugiya, Hiroshi
Article History
Received: 16 August 2016
Accepted: 29 November 2016
First Online: 5 January 2017
Competing interests
: The authors declare no competing financial interests.