CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 06,2004, Pages 361-364, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 06,2004, Pages 365-368, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 06,2004, Pages 369-372, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 06,2004, Pages 373-377, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 39, Issue 06,2004, Pages 378-381, Dol: