CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 7,2002, Pages 444-446, doi:10.3760/j.issn:0529-567X.2002.07.029
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 7,2002, Pages 411-412, doi:10.3760/j.issn:0529-567X.2002.07.009
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 7,2002, Pages 433-434, doi:10.3760/j.issn:0529-567X.2002.07.025
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 7,2002, Pages 417-418, doi:10.3760/j.issn:0529-567X.2002.07.013