Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 07,2012, Pages 487-491, Dol:10.3760/cma.j.issn.0529-567x.2012.07.003
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 07,2012, Pages 492-495, Dol:10.3760/cma.j.issn.0529-567x.2012.07.004
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 07,2012, Pages 496-499, Dol:10.3760/cma.j.issn.0529-567x.2012.07.005
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 07,2012, Pages 500-504, Dol:10.3760/cma.j.issn.0529-567x.2012.07.006
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 07,2012, Pages 505-509, Dol:10.3760/cma.j.issn.0529-567x.2012.07.007