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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 2,2001, Pages 85-88, doi:10.3760/j.issn:0529-567X.2001.02.006
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 2,2001, Pages 98-100, doi:10.3760/j.issn:0529-567X.2001.02.010