Luk, F O J
Fok, A C T
Lee, A
Liu, A T W
Lai, T Y Y
Article History
Received: 6 October 2014
Accepted: 24 December 2014
First Online: 27 March 2015
Competing interests
: Dr Timothy Lai has received honorarium for consultancy and lecture fees from Alcon, Allergan Inc, Bausch & Lomb, Bayer Healthcare, Heidelberg Engineering and Novartis Pharmapeuticals. The remaining authors declare no conflict of interest.