CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 7,2000, Pages 437, doi:10.3760/j.issn:0529-567X.2000.07.020
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 7,2000, Pages 422, doi:10.3760/j.issn:0529-567X.2000.07.030
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 7,2000, Pages 417, doi:10.3760/j.issn:0529-567X.2000.07.011
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 7,2000, Pages 399, doi:10.3760/j.issn:0529-567X.2000.07.004
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 35, Issue 7,2000, Pages 429, doi:10.3760/j.issn:0529-567X.2000.07.032