Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 10,2012, Pages 793-796, doi:10.3760/cma.j.issn.0529-567x.2012.10.017
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 10,2012, Pages 781-786, doi:10.3760/cma.j.issn.0529-567x.2012.10.013
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 10,2012, Pages 791-792, doi:10.3760/cma.j.issn.0529-567x.2012.10.016
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 10,2012, Pages 730-733, doi:10.3760/cma.j.issn.0529-567x.2012.10.003
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 10,2012, Pages 742-746, doi:10.3760/cma.j.issn.0529-567x.2012.10.006