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Changes in serum intact parathyroid hormone (iPTH) level before and after subtotal parathyroidectomy. Dashed lines indicate patients with recurrent hyperparathyroidism, and the dash-dotted line indicates one patient with permanent hypoparathyroidism. The solid black line indicates the reference value for recurrent hyperparathyroidism (195 pg/mL). Pre, preoperative; Post, postoperative.
