Yang, Xian
Tang, Zhiyao
Ji, Chengjun
Liu, Hongyan
Ma, Wenhong
Mohhamot, Anwar
Shi, Zhaoyong
Sun, Wei
Wang, Tao
Wang, Xiangping
Wu, Xian
Yu, Shunli
Yue, Ming
Zheng, Chengyang
Article History
Received: 10 February 2014
Accepted: 29 May 2014
First Online: 26 June 2014
Competing interests
: The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.