Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 09,2012, Pages 641-645, Dol:10.3760/cma.j.issn.0529-567x.2012.09.001
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 09,2012, Pages 646-650, Dol:10.3760/cma.j.issn.0529-567x.2012.09.002
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 09,2012, Pages 651-654, Dol:10.3760/cma.j.issn.0529-567x.2012.09.003
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 09,2012, Pages 655-658, Dol:10.3760/cma.j.issn.0529-567x.2012.09.004
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 09,2012, Pages 659-663, Dol:10.3760/cma.j.issn.0529-567x.2012.09.005