Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 7,2012, Pages 546-548, doi:10.3760/cma.j.issn.0529-567x.2012.07.020
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 7,2012, Pages 532-533, doi:10.3760/cma.j.issn.0529-567x.2012.07.014
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 7,2012, Pages 526-529, doi:10.3760/cma.j.issn.0529-567x.2012.07.012
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 7,2012, Pages 514-517, doi:10.3760/cma.j.issn.0529-567x.2012.07.009
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 7,2012, Pages 496-499, doi:10.3760/cma.j.issn.0529-567x.2012.07.005