CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, Volume 33, Issue 9,1998, Pages 566, doi:10.3760/j.issn:0529-567X.1998.09.019
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CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, Volume 33, Issue 9,1998, Pages 539, doi:10.3760/j.issn:0529-567X.1998.09.008