JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 5,2011, Pages 378-382, doi:10.3969/j.issn.1003-6946.2011.05.021
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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 5,2011, Pages 358-361, doi:10.3969/j.issn.1003-6946.2011.05.015
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 27, Issue 5,2011, Pages 365-368, doi:10.3969/j.issn.1003-6946.2011.05.017