Shen, J
Tsoi, H
Liang, Q
Chu, E S H
Liu, D
Yu, A C-S
Chan, T F
Li, X http://orcid.org/0000-0001-8791-7505
Sung, J J Y
Wong, V W S
Yu, J
Article History
Received: 7 December 2015
Revised: 1 April 2016
Accepted: 3 April 2016
First Online: 2 May 2016
Competing interests
: The authors declare no conflict of interest.