CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 12,2002, Pages 745-746, doi:10.3760/j.issn:0529-567X.2002.12.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 12,2002, Pages 746, doi:10.3760/j.issn:0529-567X.2002.12.024
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 12,2002, Pages 718-720, doi:10.3760/j.issn:0529-567X.2002.12.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 12,2002, Pages 729-732, doi:10.3760/j.issn:0529-567X.2002.12.009
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 12,2002, Pages 754-756, doi:10.3760/j.issn:0529-567X.2002.12.021