CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 05,2009, Pages 321-323, Dol:10.3760/cma.j.issn.0529-567x.2009.05.001
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 05,2009, Pages 324-327, Dol:10.3760/cma.j.issn.0529-567x.2009.05.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 05,2009, Pages 328-332, Dol:10.3760/cma.j.issn.0529-567x.2009.05.003
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 05,2009, Pages 333-336, Dol:10.3760/cma.j.issn.0529-567x.2009.05.004
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 44, Issue 05,2009, Pages 337-340, Dol:10.3760/cma.j.issn.0529-567x.2009.05.005