JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 4,2011, Pages 276-280, doi:10.3969/j.issn.1003-6946.2011.04.015
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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 4,2011, Pages 260-264, doi:10.3969/j.issn.1003-6946.2011.04.010