RT Journal Article SR Electronic T1 Conservative vs surgical treatment of hyperparathyroidism: which to choose, and when? JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 191 OP 192 VO 60 IS 3 A1 Agus, Zalman S. YR 1993 UL http://www.ccjm.org/content/60/3/191.abstract AB