Retraction
This article has been retracted by the authors [1] because large portions of text have been duplicated from a number of previously published articles, including Tin et al., 2007 [2] and Auyeung et al., 2009 [3]. All authors agree with the retraction.
Footnotes
The online version of the original article can be found under doi:10.1186/1746-1596-8-179
Contributor Information
Wenqiao Zang, Email: zangwenqiao@sina.com.
Guoqiang Zhao, Email: zhaogq@zzu.edu.cn.
References
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