 Of patients with differentiated papillary thyroid carcinoma, group D underwent total thyroidectomy alone and groups A-C underwent total thyroidectomy plus CND. The latter were randomized to oral calcium 3 gday plus vitamin D 1 mcgday group A, n 49, calcium alone group B, n 49, or no supplements group C, n 50. Hypocalcemic symptoms, serum calcium, and parathyroid hormone PTH levels were compared among the groups. 