RT Journal Article SR Electronic T1 The role of biopsy in fiberoptic esophagogastroscopy JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 189 OP 200 VO 37 IS 4 A1 Nensel, Richard E. A1 Sullivan, B. H. YR 1970 UL http://www.ccjm.org/content/37/4/189.abstract AB