JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 8,2009, Pages 463-464, doi:10.3969/j.issn.1003-6946.2009.08.008
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 8,2009, Pages 465-467, doi:10.3969/j.issn.1003-6946.2009.08.009
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 8,2009, Pages 484-486, doi:10.3969/j.issn.1003-6946.2009.08.016
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 8,2009, Pages 489-491, doi:10.3969/j.issn.1003-6946.2009.08.017
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 8,2009, Pages 455-456, doi:10.3969/j.issn.1003-6946.2009.08.004