CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 11,2008, Pages 854-858, doi:10.3321/j.issn:0529-567X.2008.11.013
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 11,2008, Pages 814-817, doi:10.3321/j.issn:0529-567X.2008.11.004
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 11,2008, Pages 859-861, doi:10.3321/j.issn:0529-567X.2008.11.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 11,2008, Pages 876-880, doi:10.3321/j.issn:0529-567X.2008.11.021
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 11,2008, Pages 865-866, doi:10.3321/j.issn:0529-567X.2008.11.017