CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 9,2009, Pages 699-700, doi:10.3760/cma.j.issn.0529-567x.2009.09.018
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 9,2009, Pages 686-690, doi:10.3760/cma.j.issn.0529-567x.2009.09.013
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 9,2009, Pages 703-704, doi:10.3760/cma.j.issn.0529-567x.2009.09.020
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 9,2009, Pages 681-685, doi:10.3760/cma.j.issn.0529-567x.2009.09.012
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 9,2009, Pages 665-668, doi:10.3760/cma.j.issn.0529-567x.2009.09.008