CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 8,2001, Pages 502, doi:10.3760/j.issn:0529-567X.2001.08.029
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 8,2001, Pages 496-497, doi:10.3760/j.issn:0529-567X.2001.08.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 8,2001, Pages 473-475, doi:10.3760/j.issn:0529-567X.2001.08.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 8,2001, Pages 470-472, doi:10.3760/j.issn:0529-567X.2001.08.007