Chinese Journal of Obstetrics and Gynecology, Volume 51, Issue 8,2016, Pages 608-615, doi:10.3760/cma.j.issn.0529-567x.2016.08.011
Chinese Journal of Obstetrics and Gynecology, Volume 51, Issue 8,2016, Pages 616-619, doi:10.3760/cma.j.issn.0529-567x.2016.08.012
Chinese Journal of Obstetrics and Gynecology, Volume 51, Issue 8,2016, Pages 561-564, doi:10.3760/cma.j.issn.0529-567x.2016.08.001
Chinese Journal of Obstetrics and Gynecology, Volume 51, Issue 8,2016, Pages 586-591, doi:10.3760/cma.j.issn.0529-567x.2016.08.007
Chinese Journal of Obstetrics and Gynecology, Volume 51, Issue 8,2016, Pages 573-575, doi:10.3760/cma.j.issn.0529-567x.2016.08.004