CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 3,2011, Pages 177-180, doi:10.3760/cma.j.issn.0529-567x.2011.03.004
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 3,2011, Pages 230-233, doi:10.3760/cma.j.issn.0529-567x.2011.03.018
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 3,2011, Pages 199-204, doi:10.3760/cma.j.issn.0529-567x.2011.03.009
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