CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 6,2008, Pages 451-452, doi:10.3321/j.issn:0529-567X.2008.06.013
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 6,2008, Pages 445-450, doi:10.3321/j.issn:0529-567X.2008.06.012
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 6,2008, Pages 414-417, doi:10.3321/j.issn:0529-567X.2008.06.004
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 6,2008, Pages 474, doi:10.3321/j.issn:0529-567X.2008.06.024