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机构:
Lanzhou Univ, Sch Clin Med 1, Lanzhou, Peoples R China
Lanzhou Univ, Hosp 1, Dept Obstet & Gynecol, Key Lab Gynecol Oncol Gansu Prov, Lanzhou, Peoples R China
Lanzhou Univ, Evidence Based Med Ctr, Sch Basic Med Sci, Lanzhou, Peoples R China
Key Lab Evidence Based Med & Knowledge Translat Ga, Lanzhou, Peoples R China
Gansu Prov Matern & Child Care Hosp, Cent Hosp Gansu Prov, Gansu Prov Prenatal Diag Ctr, Key Lab Prevent & Control Birth Defects Gansu Prov, Lanzhou, Peoples R China
Lanzhou Univ, Evidence Based Social Sci Res Ctr, Sch Publ Hlth, Lanzhou, Peoples R China Lanzhou Univ, Sch Clin Med 1, Lanzhou, Peoples R China