CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 12,2000, Pages 730, doi:10.3760/j.issn:0529-567X.2000.12.009
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 12,2000, Pages 733, doi:10.3760/j.issn:0529-567X.2000.12.010
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 12,2000, Pages 721, doi:10.3760/j.issn:0529-567X.2000.12.022