Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 2,2013, Pages 123-128, doi:10.3760/cma.j.issn.0529-567x.2013.02.009
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 2,2013, Pages 151-154, doi:10.3760/cma.j.issn.0529-567x.2013.02.017
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 2,2013, Pages 155-158, doi:10.3760/cma.j.issn.0529-567x.2013.02.018
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 2,2013, Pages 86-91, doi:10.3760/cma.j.issn.0529-567x.2013.02.002
Chinese Journal of Obstetrics and Gynecology, Volume 48, Issue 2,2013, Pages 102-106, doi:10.3760/cma.j.issn.0529-567x.2013.02.005