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机构:
Gothenburg Univ, Sahlgrenska Univ Hosp, Sahlgrenska Acad, Perinatal Ctr,Dept Obstet & Gynecol,Inst Clin Sci, S-41685 Gothenburg, Sweden
Karolinska Univ Hosp, Dept Obstet & Gynecol, S-17176 Stockholm, Sweden Gothenburg Univ, Sahlgrenska Acad, Inst Hlth & Caring Sci, S-40530 Gothenburg, Sweden