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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 3,2004, Pages 159-161, doi:10.3760/j.issn:0529-567X.2004.03.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 3,2004, Pages 156-158, doi:10.3760/j.issn:0529-567X.2004.03.004