Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 9,2012, Pages 755-758, doi:10.3969/j.issn.1003-6946.2012.09.017
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 9,2012, Pages 743-747, doi:10.3969/j.issn.1003-6946.2012.09.014
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 9,2012, Pages 777-780, doi:10.3969/j.issn.1003-6946.2012.09.025
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 9,2012, Pages 781-782, doi:10.3969/j.issn.1003-6946.2012.09.026
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 9,2012, Pages 732-736, doi:10.3969/j.issn.1003-6946.2012.09.011