This study was performed by Ze-Xian Liu

Ze-Xian Liu is from

Sun Yat-sen University Cancer Center,

Building 2#20F, 651 Dongfeng East Road,

Guangzhou 510060, P. R. China

Contact: Ze-Xian Liu

Email: liuzx AT sysucc.org.cn

Tel/Fax: +86-20-87342025