Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 4,2012, Pages 245-249, doi:10.3760/cma.j.issn.0529-567x.2012.04.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 4,2012, Pages 299-300, doi:10.3760/cma.j.issn.0529-567x.2012.04.013
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 4,2012, Pages 312-314, doi:10.3760/cma.j.issn.0529-567x.2012.04.018
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 4,2012, Pages 307-308, doi:10.3760/cma.j.issn.0529-567x.2012.04.016
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 4,2012, Pages 286-291, doi:10.3760/cma.j.issn.0529-567x.2012.04.010