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A, Perioperative PTH levels; B, perioperative calcium levels. Points 4 and 5 are the intraoperative PTH measurements. Points 1, 2, and 3 are from 6 weeks, 2 weeks, and 1 week before the operation, respectively. Points 6, 7, and 8 are from 1, 2, and 30 days after the operation, respectively.
