CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 721-724, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 725-728, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 729-732, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 733-736, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 11,2004, Pages 737-740, Dol: