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Change in mean postoperative serum parathyroid hormone (PTH) level on Day 1, at 3 months, 6 months, 12 months, and 2 years after parathyroidectomy in those with normal PTH level at 6 months (group A) and those with elevated PTH at 6 months (group B); blue line represents group A (n = 98); yellow line represents group B (n = 63)
