Cui, Guozhen
Shan, Luchen
Guo, Lin
Chu, Ivan Keung
Li, Guohui
Quan, Quan
Zhao, Yun
Chong, Cheong Meng
Zhang, Zaijun
Yu, Pei
Hoi, Maggie Pui Man
Sun, Yewei
Wang, Yuqiang
Lee, Simon MingYuen
Article History
Received: 30 November 2014
Accepted: 9 April 2015
First Online: 3 June 2015
Change Date: 2 September 2015
Change Type: Update
Change Details: A correction has been published and is appended to both the HTML and PDF versions of this paper. The error has not been fixed in the paper.
Competing interests
: The authors declare no competing financial interests.