CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 05,2002, Pages 257-259, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 05,2002, Pages 260-262, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 05,2002, Pages 263-266, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 05,2002, Pages 267-270, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 05,2002, Pages 271-273, Dol: