CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 546-548, doi:10.3760/cma.j.issn.0529-567x.2011.07.017
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 487-491, doi:10.3760/cma.j.issn.0529-567x.2011.07.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 544-545, doi:10.3760/cma.j.issn.0529-567x.2011.07.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 548-550, doi:10.3760/cma.j.issn.0529-567x.2011.07.018
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 46, Issue 7,2011, Pages 492-495, doi:10.3760/cma.j.issn.0529-567x.2011.07.003