[1] Sun Yat Sen Univ, Ctr Canc, Guangdong Prov Clin Res Ctr Canc, State Key Lab Oncol South China,Guangdong Key Lab, Guangzhou, Peoples R China
[2] Zhejiang Univ, Hangzhou, Peoples R China
[3] Sun Yat Sen Univ, Canc Ctr, Guangzhou, Peoples R China
[4] Sun Yat Sen Univ, Canc Ctr, Dept Radiat Oncol,Guangdong Esophageal Canc Res I, State Key Lab Oncol South China,Guangdong Prov Cl, Guangzhou, Peoples R China
[5] Duke Univ, Dept Populat Hlth Sci, Sch Med, Durham, NC USA