Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 561-563, doi:10.3760/cma.j.issn.0529-567x.2012.08.001
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 564-565, doi:10.3760/cma.j.issn.0529-567x.2012.08.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 577-581, doi:10.3760/cma.j.issn.0529-567x.2012.08.005
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 634-635, doi:10.3760/cma.j.issn.0529-567x.2012.08.019
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 621-623, doi:10.3760/cma.j.issn.0529-567x.2012.08.014