CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 650, doi:10.3760/j.issn:0529-567X.2000.11.025
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 686, doi:10.3760/j.issn:0529-567X.2000.11.034
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 11,2000, Pages 670, doi:10.3760/j.issn:0529-567X.2000.11.009