Watcharanurak, K
Zang, L
Nishikawa, M
Yoshinaga, K
Yamamoto, Y
Takahashi, Y
Ando, M
Saito, K
Watanabe, Y
Takakura, Y
Article History
Received: 10 December 2013
Revised: 2 May 2014
Accepted: 6 May 2014
First Online: 12 June 2014
Competing interests
: The authors declare no conflict of interest.