Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 7,2012, Pages 521-523, doi:10.3969/j.issn.1003-6946.2012.07.004
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 7,2012, Pages 536,540,554,580,585,590,
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 7,2012, Pages 518-521, doi:10.3969/j.issn.1003-6946.2012.07.003
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 7,2012, Pages 551-554, doi:10.3969/j.issn.1003-6946.2012.07.014
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 7,2012, Pages 576-579, doi:10.3969/j.issn.1003-6946.2012.07.021