JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 12,2009, Pages 727-729, doi:10.3969/j.issn.1003-6946.2009.12.011
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 12,2009, Pages 716-717, doi:10.3969/j.issn.1003-6946.2009.12.007
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 12,2009, Pages 749, doi:10.3969/j.issn.1003-6946.2009.12.026
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 12,2009, Pages 721-723, doi:10.3969/j.issn.1003-6946.2009.12.009
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 12,2009, Pages 748-749, doi:10.3969/j.issn.1003-6946.2009.12.019