Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 1,2014, Pages 61-63, doi:10.3760/cma.j.issn.0529-567x.2014.01.018
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 1,2014, Pages 18-21, doi:10.3760/cma.j.issn.0529-567x.2014.01.006
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 1,2014, Pages 36-41, doi:10.3760/cma.j.issn.0529-567x.2014.01.010
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 1,2014, Pages 70-72, doi:10.3760/cma.j.issn.0529-567x.2014.01.021
Chinese Journal of Obstetrics and Gynecology, Volume 49, Issue 1,2014, Pages 64-66, doi:10.3760/cma.j.issn.0529-567x.2014.01.019