Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 3,2012, Pages 218-219, doi:10.3760/cma.j.issn.0529-567x.2012.03.012
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 3,2012, Pages 237-240, doi:10.3760/cma.j.issn.0529-567x.2012.03.021
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 3,2012, Pages 171-174, doi:10.3760/cma.j.issn.0529-567x.2012.03.003
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 3,2012, Pages 220-222, doi:10.3760/cma.j.issn.0529-567x.2012.03.013
Chinese Journal of Obstetrics and Gynecology, Volume 47, Issue 3,2012, Pages 175-178, doi:10.3760/cma.j.issn.0529-567x.2012.03.004