JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 26, Issue 8,2010, Pages 594-597, doi:10.3969/j.issn.1003-6946.2010.08.014
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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 26, Issue 8,2010, Pages 569-572, doi:10.3969/j.issn.1003-6946.2010.08.005