CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 754-758, doi:10.3760/j.issn:0529-567X.2004.11.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 759-762, doi:10.3760/j.issn:0529-567X.2004.11.011
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 733-736, doi:10.3760/j.issn:0529-567X.2004.11.004
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 744-746, doi:10.3760/j.issn:0529-567X.2004.11.007
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 763-766, doi:10.3760/j.issn:0529-567X.2004.11.012