CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 12,2006, Pages 793-798, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 12,2006, Pages 799-802, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 12,2006, Pages 803-805, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 12,2006, Pages 806-809, Dol:
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 12,2006, Pages 810-813, Dol: