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Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 4,2013, Pages 252-253, doi:10.3760/cma.j.issn.0529-567x.2013.04.007
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 4,2013, Pages 243, doi:10.3760/cma.j.issn.0529-567x.2013.04.002
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 4,2013, Pages 261-263, doi:10.3760/cma.j.issn.0529-567x.2013.04.013
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 4,2013, Pages 255-257, doi:10.3760/cma.j.issn.0529-567x.2013.04.009