Journal of Practical Obstetrics and Gynecology, Volume 27, Issue 12,2011, Pages 894-897, doi:10.3969/j.issn.1003-6946.2011.12.008
Journal of Practical Obstetrics and Gynecology, Volume 27, Issue 12,2011, Pages 928-932, doi:10.3969/j.issn.1003-6946.2011.12.018
Journal of Practical Obstetrics and Gynecology, Volume 27, Issue 12,2011, Pages 948-950, doi:10.3969/j.issn.1003-6946.2011.12.027
Journal of Practical Obstetrics and Gynecology, Volume 27, Issue 12,2011, Pages 914-917, doi:10.3969/j.issn.1003-6946.2011.12.014
Journal of Practical Obstetrics and Gynecology, Volume 27, Issue 12,2011, Pages 897-900, doi:10.3969/j.issn.1003-6946.2011.12.009