RT Journal Article SR Electronic T1 Efficacy of endorectal ultrasonography in preoperative staging of rectal carcinoma JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1781 OP 1781 VO 27 IS 11 A1 Alaa A. Jabbar YR 2006 UL http://smj.org.sa/content/27/11/1781.1.abstract