CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 8,2008, Pages 629-631, doi:10.3321/j.issn:0529-567X.2008.08.020
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 8,2008, Pages 561-562, doi:10.3321/j.issn:0529-567X.2008.08.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 8,2008, Pages 571-575, doi:10.3321/j.issn:0529-567X.2008.08.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 8,2008, Pages 589-592, doi:10.3321/j.issn:0529-567X.2008.08.009
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 43, Issue 8,2008, Pages 563-566, doi:10.3321/j.issn:0529-567X.2008.08.003