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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 10,2007, Pages 662-665, doi:10.3760/j.issn:0529-567x.2007.10.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 10,2007, Pages 713-715, doi:10.3760/j.issn:0529-567x.2007.10.019
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 10,2007, Pages 711-712, doi:10.3760/j.issn:0529-567x.2007.10.018