CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 12,2006, Pages 843-844, doi:10.3760/j.issn:0529-567X.2006.12.015
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 12,2006, Pages 852-853, doi:10.3760/j.issn:0529-567X.2006.12.019
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