CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 3,2002, Pages 173-174, doi:10.3760/j.issn:0529-567X.2002.03.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 3,2002, Pages 180-181, doi:10.3760/j.issn:0529-567X.2002.03.021
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 3,2002, Pages 157-160, doi:10.3760/j.issn:0529-567X.2002.03.011
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 3,2002, Pages 176-177, doi:10.3760/j.issn:0529-567X.2002.03.019
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 3,2002, Pages 161-163, doi:10.3760/j.issn:0529-567X.2002.03.012