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机构:
Univ Stellenbosch, Tygerberg Hosp, Dept Obstet & Gynaecol, POB 241, ZA-8000 Cape Town, South Africa
Uppsala Univ, Dept Womens & Childrens Hlth, POB 256, SE-75105 Uppsala, Sweden
Univ Gothenburg, Sahlgrenska Acad, Inst Clin Sci, Dept Obstet & Gynecol, Box 100, SE-40530 Gothenburg, Sweden Univ Stellenbosch, Tygerberg Hosp, Dept Obstet & Gynaecol, POB 241, ZA-8000 Cape Town, South Africa