Lal, S
Sutiman, N
Ooi, L L
Wong, Z W
Wong, N S
Ang, P C S
Chowbay, B
Article History
Received: 3 August 2015
Revised: 4 February 2016
Accepted: 9 February 2016
First Online: 15 March 2016
Competing interests
: The authors declare no conflict of interest.