Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 1,2012, Pages 28-31, doi:10.3969/j.issn.1003-6946.2012.01.013
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 1,2012, Pages 60-63, doi:10.3969/j.issn.1003-6946.2012.01.022
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 1,2012, Pages 40-44, doi:10.3969/j.issn.1003-6946.2012.01.016
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 1,2012, Pages 77, doi:10.3969/j.issn.1003-6946.2012.01.029
Journal of Practical Obstetrics and Gynecology, Volume 28, Issue 1,2012, Pages 44, doi:10.3969/j.issn.1003-6946.2012.01.017