CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 8,2009, Pages 583-587, doi:10.3760/cma.j.issn.0529-567x.2009.08.007
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 8,2009, Pages 619-620, doi:10.3760/cma.j.issn.0529-567x.2009.08.017
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 8,2009, Pages 621-623, doi:10.3760/cma.j.issn.0529-567x.2009.08.018
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