RT Journal Article SR Electronic T1 Gastrointestinal hormones and apudomas JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 83 OP 93 VO 44 IS 2 A1 Cooperman, Avram M. YR 1977 UL http://www.ccjm.org/content/44/2/83.abstract AB