CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, , Issue 6,1998, Pages 349, doi:10.3760/j.issn:0529-567X.1998.06.009
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CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, , Issue 6,1998, Pages 334, doi:10.3760/j.issn:0529-567X.1998.06.004