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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 5,2007, Pages 345-347, doi:10.3760/j.issn:0529-567x.2007.05.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 5,2007, Pages 298-301, doi:10.3760/j.issn:0529-567x.2007.05.004