CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 559-560, doi:10.3760/j.issn:0529-567x.2007.08.015
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 542-545, doi:10.3760/j.issn:0529-567x.2007.08.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 537-541, doi:10.3760/j.issn:0529-567x.2007.08.009