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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 21, Issue 3,2005, Pages 160-161, doi:10.3969/j.issn.1003-6946.2005.03.014
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 21, Issue 3,2005, Pages 177-177, doi:10.3969/j.issn.1003-6946.2005.03.031