Katagiri, Satoshi
Nishina, Sachiko
Yokoi, Tadashi
Mikami, Masashi
Nakayama, Yuri
Tanaka, Michiko
Azuma, Noriyuki
Article History
Received: 2 August 2016
Accepted: 11 January 2017
First Online: 16 February 2017
Competing interests
: The authors declare no competing financial interests.