Higashi, T
Hayashi, H
Ishimoto, T
Takeyama, H
Kaida, T
Arima, K
Taki, K
Sakamoto, K
Kuroki, H
Okabe, H
Nitta, H
Hashimoto, D
Chikamoto, A
Beppu, T
Baba, H
Article History
Received: 7 February 2015
Revised: 17 March 2015
Accepted: 14 April 2015
First Online: 30 June 2015
Competing interests
: The authors declare no conflict of interest.