JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 6,2009, Pages 360-363, doi:10.3969/j.issn.1003-6946.2009.06.016
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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 6,2009, Pages 333-335, doi:10.3969/j.issn.1003-6946.2009.06.007
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 25, Issue 6,2009, Pages 336-338, doi:10.3969/j.issn.1003-6946.2009.06.008