RT Journal Article SR Electronic T1 The optimal dose of intrathecal sufentanil to be added to low-dose intrathecal ropivacaine during anesthesia for cesarean delivery. JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 855 OP 857 VO 32 IS 8 A1 Sun, Ming Y. A1 Liao, Qin A1 Luo, Xiao H. A1 Ouyang, Wen YR 2011 UL http://smj.org.sa/content/32/8/855.abstract AB Erratum Published In: Saudi Med J 2011; 32 (10): 1090.