CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 10,2008, Pages 742-745, doi:10.3321/j.issn:0529-567X.2008.10.006
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 10,2008, Pages 757-759, doi:10.3321/j.issn:0529-567X.2008.10.009
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 10,2008, Pages 732-736, doi:10.3321/j.issn:0529-567X.2008.10.004
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 10,2008, Pages 721-723, doi:10.3321/j.issn:0529-567X.2008.10.001
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 10,2008, Pages 760-763, doi:10.3321/j.issn:0529-567X.2008.10.010