CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 2,2011, Pages 144-146, doi:10.3760/cma.j.issn.0529-567x.2011.02.016
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 2,2011, Pages 147-149, doi:10.3760/cma.j.issn.0529-567x.2011.02.017