RT Journal Article SR Electronic T1 Observations Regarding the Prognosis and Diagnosis of Hyperparathyroidism JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 253 OP 256 VO 20 IS 1 A1 Hellstrom, John YR 1953 UL http://www.ccjm.org/content/20/1/253.abstract AB