CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 40, Issue 9,2005, Pages 581-584, doi:10.3760/j.issn:0529-567X.2005.09.002
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 40, Issue 9,2005, Pages 638-639, doi:10.3760/j.issn:0529-567X.2005.09.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 40, Issue 9,2005, Pages 644-645, doi:10.3760/j.issn:0529-567X.2005.09.019
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