Jia, D
Yang, W
Li, L
Liu, H
Tan, Y
Ooi, S
Chi, L
Filion, L G
Figeys, D
Wang, L
Article History
Received: 28 January 2014
Revised: 26 June 2014
Accepted: 4 August 2014
First Online: 26 September 2014
Competing interests
: The authors declare no conflict of interest.