Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 04,2012, Pages 241-244, Dol:10.3760/cma.j.issn.0529-567x.2012.04.001
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 04,2012, Pages 245-249, Dol:10.3760/cma.j.issn.0529-567x.2012.04.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 04,2012, Pages 250-254, Dol:10.3760/cma.j.issn.0529-567x.2012.04.003
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 04,2012, Pages 255-258, Dol:10.3760/cma.j.issn.0529-567x.2012.04.004
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 04,2012, Pages 259-262, Dol:10.3760/cma.j.issn.0529-567x.2012.04.005