Yamanaka, Ryu
Tabata, Sho
Shindo, Yutaka
Hotta, Kohji
Suzuki, Koji
Soga, Tomoyoshi
Oka, Kotaro
Article History
Received: 4 May 2016
Accepted: 28 June 2016
First Online: 26 July 2016
Competing interests
: The authors declare no competing financial interests.