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机构:
Univ Calif San Francisco, Dept Obstetr, San Francisco, CA 94143 USA
Univ Calif San Francisco, Dept Gynecol, San Francisco, CA 94143 USA
Univ Calif San Francisco, Dept Reprod Sci, San Francisco, CA 94143 USA
Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA Massachusetts Gen Hosp, Dept Obstet & Gynecol, Boston, MA 02114 USA