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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 7,2007, Pages 491-492, doi:10.3760/j.issn:0529-567x.2007.07.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 7,2007, Pages 472-476, doi:10.3760/j.issn:0529-567x.2007.07.011
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 7,2007, Pages 460-463, doi:10.3760/j.issn:0529-567x.2007.07.008