Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 634-635, doi:10.3760/cma.j.issn.0529-567x.2012.08.019
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 636-638, doi:10.3760/cma.j.issn.0529-567x.2012.08.020
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 561-563, doi:10.3760/cma.j.issn.0529-567x.2012.08.001
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 629-631, doi:10.3760/cma.j.issn.0529-567x.2012.08.017
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 8,2012, Pages 621-623, doi:10.3760/cma.j.issn.0529-567x.2012.08.014