This study was performed by Yan Yuan, Bijin Cao, Zhikai Qian, Zekun Liu,Zhi-Xiang Zuo, Ze-Xian Liu and YH Gao

Yan Yuan, Zhikai Qian, Zekun Liu, Zhi-Xiang Zuo, Ze-Xian Liu and YH Gao are from

Sun Yat-sen University Cancer Center,

Building 2#20F, 651 Dongfeng East Road,

Guangzhou 510060, P. R. China

Bijin Cao is from

Zhengzhou University,

100 Science Avenue,

Zhengzhou 450001, P. R. China

Contact: Ze-Xian Liu

Email: liuzx AT sysucc.org.cn

Tel/Fax: +86-20-87342025