Nanjing Med Univ;
Canc Res Ctr;
Dept Epidemiol & Biostat;
Nanjing 210029;
Peoples R China.;
Nanjing Med Univ;
Sch Publ Hlth;
Toxicol Lab;
Nanjing 210029;
Peoples R China.;
Yixing Peoples Hosp;
Yixing 214200;
Jiangsu;
Peoples R China.;
Yangzhong Canc Inst;
Yangzhong City 212200;
Jiangsu;
Peoples R China.;