RT Journal Article SR Electronic T1 Hyperparathyroidism—epidemic or endemic? JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 87 OP 91 VO 37 IS 2 A1 Caldwell B. Esselstyn, Jr. A1 George Crile, Jr. YR 1970 UL http://www.ccjm.org/content/37/2/87.abstract AB