CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 8,2002, Pages 469-471, doi:10.3760/j.issn:0529-567X.2002.08.007
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 8,2002, Pages 481-483, doi:10.3760/j.issn:0529-567X.2002.08.011
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 8,2002, Pages 465-468, doi:10.3760/j.issn:0529-567X.2002.08.006
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 8,2002, Pages 454, doi:10.3760/j.issn:0529-567X.2002.08.026