CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 5,2009, Pages 369-373, doi:10.3760/cma.j.issn.0529-567x.2009.05.012
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 5,2009, Pages 359-363, doi:10.3760/cma.j.issn.0529-567x.2009.05.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 5,2009, Pages 381-382, doi:10.3760/cma.j.issn.0529-567x.2009.05.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 5,2009, Pages 379-380, doi:10.3760/cma.j.issn.0529-567x.2009.05.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 5,2009, Pages 333-336, doi:10.3760/cma.j.issn.0529-567x.2009.05.004