RT Journal Article SR Electronic T1 Massive Upper Gastrointestinal Hemorrhage JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 141 OP 148 VO 17 IS 3 A1 Hoerr, Stanley O. YR 1950 UL http://www.ccjm.org/content/17/3/141.abstract AB