[1] Jilin Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, Changchun, Jilin, Peoples R China
[2] China Med Univ, Sch Publ Hlth, Dept Biostat & Epidemiol, Shenyang, Liaoning, Peoples R China
[3] Jilin Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, 1163 Xinmin St, Changchun 130021, Jilin, Peoples R China
[4] China Med Univ, Sch Publ Hlth, Dept Biostat & Epidemiol, 77 Puhe Rd,Shenyang North New Area, Shenyang 110122, Liaoning, Peoples R China