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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 2,2008, Pages 152-153, doi:10.3321/j.issn:0529-567X.2008.02.021
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 2,2008, Pages 81-84, doi:10.3321/j.issn:0529-567X.2008.02.001