This study was performed by Kai Yu, Qingfeng Zhang, Yongqiang Zheng, Jinfei Lin and Ze-Xian Liu

Kai Yu, Qingfeng Zhang, Yongqiang Zheng, Jinfei Lin and Ze-Xian Liu are from

Sun Yat-sen University Cancer Center,

Building 2#, 651 Dongfeng East Road,

Guangzhou 510060, P. R. China

Email: liuzx AT sysucc.org.cn

Tel/Fax: +86-20-87342025