Lu, Lihua
Zhong, Hai-Jing
Wang, Modi
Ho, See-Lok
Li, Hung-Wing
Leung, Chung-Hang
Ma, Dik-Lung
Article History
Received: 3 March 2015
Accepted: 1 May 2015
First Online: 30 September 2015
Competing interests
: The authors declare no competing financial interests.