CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 487-491, doi:10.3760/cma.j.issn.0529-567x.2011.07.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 546-548, doi:10.3760/cma.j.issn.0529-567x.2011.07.017
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 492-495, doi:10.3760/cma.j.issn.0529-567x.2011.07.003
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 533-537, doi:10.3760/cma.j.issn.0529-567x.2011.07.012
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