CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 6,2006, Pages 399-402, doi:10.3760/j.issn:0529-567X.2006.06.011
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 6,2006, Pages 391-394, doi:10.3760/j.issn:0529-567X.2006.06.009
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