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JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 16, Issue 2,2000, Pages 87-89, doi:10.3969/j.issn.1003-6946.2000.02.016
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 16, Issue 2,2000, Pages 104-105, doi:10.3969/j.issn.1003-6946.2000.02.023
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 16, Issue 2,2000, Pages 100-101, doi:10.3969/j.issn.1003-6946.2000.02.021