CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 45, Issue 3,2010, Pages 218-220, doi:10.3760/cma.j.issn.0529-567x.2010.03.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 45, Issue 3,2010, Pages 237-238, doi:10.3760/cma.j.issn.0529-567x.2010.03.022
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