RT Journal Article SR Electronic T1 Endoscopic retrograde cholangiographic evaluation of sclerosing cholangitis JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 143 OP 147 VO 41 IS 3 A1 Lefton, Harvey B. A1 Winkelman, Eugene I. YR 1974 UL http://www.ccjm.org/content/41/3/143.abstract AB