Tomita, Shogo
Shimizu, Nobutaka
Igarashi, Noriyuki
Takagi, Hideaki
Sasaki, Sono
Sakurai, Shinichi
Article History
Received: 20 November 2016
Revised: 4 January 2017
Accepted: 5 January 2017
First Online: 8 March 2017
Competing interests
: The author declares no conflict of interest.
Free to read: This content has been made available to all.