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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 17, Issue 1,2001, Pages 12-13, doi:10.3969/j.issn.1003-6946.2001.01.009
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 17, Issue 1,2001, Pages 31-33, doi:10.3969/j.issn.1003-6946.2001.01.018