CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 9,2007, Pages 638-641, doi:10.3760/j.issn:0529-567x.2007.09.018
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 9,2007, Pages 608-611, doi:10.3760/j.issn:0529-567x.2007.09.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 9,2007, Pages 642-644, doi:10.3760/j.issn:0529-567x.2007.09.019
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 9,2007, Pages 612-616, doi:10.3760/j.issn:0529-567x.2007.09.009