Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 11,2011, Pages 873-876, doi:10.3760/cma.j.issn.0529-567x.2011.11.020
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 11,2011, Pages 801-802, doi:10.3760/cma.j.issn.0529-567x.2011.11.001
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 11,2011, Pages 834-839, doi:10.3760/cma.j.issn.0529-567x.2011.11.010
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 11,2011, Pages 870-872, doi:10.3760/cma.j.issn.0529-567x.2011.11.019
Chinese Journal of Obstetrics and Gynecology, Volume 46, Issue 11,2011, Pages 813-816, doi:10.3760/cma.j.issn.0529-567x.2011.11.005