CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 4,2001, Pages 197-198, doi:10.3760/j.issn:0529-567X.2001.04.001
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 4,2001, Pages 199-201, doi:10.3760/j.issn:0529-567X.2001.04.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 4,2001, Pages 241-242, doi:10.3760/j.issn:0529-567X.2001.04.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 4,2001, Pages 218-221, doi:10.3760/j.issn:0529-567X.2001.04.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 36, Issue 4,2001, Pages 222-225, doi:10.3760/j.issn:0529-567X.2001.04.009