CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 1,2008, Pages 72-74, doi:10.3321/j.issn:0529-567X.2008.01.021
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 1,2008, Pages 63-65, doi:10.3321/j.issn:0529-567X.2008.01.018
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 1,2008, Pages 41-44, doi:10.3321/j.issn:0529-567X.2008.01.012