He, Qing Lin
Liu, Hongchao
He, Mingquan
Lai, Ying Hoi
He, Hongtao
Wang, Gan
Law, Kam Tuen
Lortz, Rolf
Wang, Jiannong
Sou, Iam Keong
Article History
Received: 18 December 2013
Accepted: 28 May 2014
First Online: 23 June 2014
Competing interests
: The authors declare no competing financial interests.