CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, Volume 33, Issue 12,1998, Pages 726, doi:10.3760/j.issn:0529-567X.1998.12.024
CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, Volume 33, Issue 12,1998, Pages 730, doi:10.3760/j.issn:0529-567X.1998.12.019
CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, Volume 33, Issue 12,1998, Pages 715, doi:10.3760/j.issn:0529-567X.1998.12.003
CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, Volume 33, Issue 12,1998, Pages 720, doi:10.3760/j.issn:0529-567X.1998.12.005
CHINESE JOUNAL OF OBSTETRICS AND GYNECOLOGY, Volume 33, Issue 12,1998, Pages 743, doi:10.3760/j.issn:0529-567X.1998.12.015