[1] Harbin Med Univ, Sch Publ Hlth, Dept Epidemiol, Harbin, Peoples R China
[2] Harbin Med Univ, Tumor Hosp, Dept Breast Surg, Harbin 150086, Peoples R China
[3] Harbin Med Univ, Tumor Hosp, Dept Chest Surg, Harbin, Peoples R China
[4] Harbin Med Univ, Affiliated Hosp 2, Dept Gastroenterol, Harbin, Peoples R China
[5] Harbin Med Univ, Tumor Hosp, Dept Colorectal Surg, Harbin, Peoples R China
[6] Harbin Med Univ, NHC Key Lab Etiol & Epidemiol, Harbin, Peoples R China
[7] Harbin Med Univ, Sch Publ Hlth, Dept Epidemiol, 157 Baojian Rd, Harbin 150081, Heilongjiang, Peoples R China
[8] Harbin Med Univ, Tumor Hosp, Dept Colorectal Surg, 150 Haping Rd, Harbin 150081, Heilongjiang, Peoples R China