CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 3,2009, Pages 161-162, doi:10.3760/cma.j.issn.0529-567x.2009.03.001
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 3,2009, Pages 228-230, doi:10.3760/cma.j.issn.0529-567X.2009.03.018
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