Nanjing Med Univ;
Sch Publ Hlth;
Dept Epidemiol & Biostat;
Canc Res Ctr;
Nanjing 210029;
Peoples R China;
Nanjing Med Univ;
Sch Publ Hlth;
Toxicol Lab;
Nanjing;
Peoples R China;
Yixing Peoples Hosp;
Yixing;
Jiangsu;
Peoples R China;
Yangzhong Canc Inst;
Yangzhong;
Jiangsu;
Peoples R China;
Univ Calif Los Angeles;
Sch Publ Hlth;
Dept Epidemiol;
Los Angeles;
CA 90024 USA;