CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, , Issue 3,1998, Pages 163, doi:10.3760/j.issn:0529-567X.1998.03.011
CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, , Issue 3,1998, Pages 162, doi:10.3760/j.issn:0529-567X.1998.03.014
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CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, , Issue 3,1998, Pages 135, doi:10.3760/j.issn:0529-567X.1998.03.035