CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 4,2007, Pages 262-263, doi:10.3760/j.issn:0529-567x.2007.04.014
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 4,2007, Pages 236-238, doi:10.3760/j.issn:0529-567x.2007.04.006
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 4,2007, Pages 244-248, doi:10.3760/j.issn:0529-567x.2007.04.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 4,2007, Pages 253-256, doi:10.3760/j.issn:0529-567x.2007.04.010