Huo, J
Ma, Y
Liu, J-J
Ho, Y S
Liu, S
Soh, L Y
Chen, S
Xu, S
Han, W http://orcid.org/0000-0002-5023-2104
Hong, A
Lim, S C
Lam, K-P
Article History
Received: 5 June 2015
Revised: 20 November 2015
Accepted: 8 January 2016
First Online: 11 February 2016
Competing interests
: The authors declare no conflict of interest.