JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 1,2006, Pages 48-50, doi:10.3969/j.issn.1003-6946.2006.01.017
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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 1,2006, Pages 34-36, doi:10.3969/j.issn.1003-6946.2006.01.013
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 1,2006, Pages 1-4, doi:10.3969/j.issn.1003-6946.2006.01.001