Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 05,2012, Pages 324-327, Dol:10.3760/cma.j.issn.0529-567x.2012.05.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 05,2012, Pages 328-332, Dol:10.3760/cma.j.issn.0529-567x.2012.05.003
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 05,2012, Pages 333-336, Dol:10.3760/cma.j.issn.0529-567x.2012.05.004
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 05,2012, Pages 337-341, Dol:10.3760/cma.j.issn.0529-567x.2012.05.005
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 05,2012, Pages 342-346, Dol:10.3760/cma.j.issn.0529-567x.2012.05.006