Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 2,2012, Pages 92-94, doi:10.3969/j.issn.1003-6946.2012.02.007
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 2,2012, Pages 150-152, doi:10.3969/j.issn.1003-6946.2012.02.025
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 2,2012, Pages 91, doi:10.3969/j.issn.1003-6946.2012.02.006
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 2,2012, Pages 139-141, doi:10.3969/j.issn.1003-6946.2012.02.021