RT Journal Article SR Electronic T1 Diagnostic medical esophagoscopy JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 217 OP 224 VO 34 IS 4 A1 Sullivan, B. H. A1 Friedman, Henry B. YR 1967 UL http://www.ccjm.org/content/34/4/217.abstract AB