Khor, S-S
Yang, W
Kawashima, M
Kamitsuji, S
Zheng, X
Nishida, N
Sawai, H
Toyoda, H
Miyagawa, T
Honda, M
Kamatani, N
Tokunaga, K
Article History
Received: 15 August 2014
Revised: 23 October 2014
Accepted: 19 December 2014
First Online: 24 February 2015
Competing interests
: The authors declare no conflict of interest.