CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 9,2002, Pages 526-528, doi:10.3760/j.issn:0529-567X.2002.09.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 9,2002, Pages 536-538, doi:10.3760/j.issn:0529-567X.2002.09.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 9,2002, Pages 559-560, doi:10.3760/j.issn:0529-567X.2002.09.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 9,2002, Pages 522, doi:10.3760/j.issn:0529-567X.2002.09.024
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 9,2002, Pages 523-525, doi:10.3760/j.issn:0529-567X.2002.09.004