Liao, Dan
Hou, Shengping
Zhang, Jun
Fang, Jing
Liu, Yunjia
Bai, Lin
Cao, Qingfeng
Aize Kijlstra,
Yang, Peizeng
Article History
Received: 11 December 2014
Accepted: 5 March 2015
First Online: 15 April 2015
Competing interests
: The authors declare no competing financial interests.