JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 6,2011, Pages 417-418, doi:10.3969/j.issn.1003-6946.2011.06.008
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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 6,2011, Pages 429-431, doi:10.3969/j.issn.1003-6946.2011.06.013
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 6,2011, Pages 406-407, doi:10.3969/j.issn.1003-6946.2011.06.003