PTH and primary hyperparathyroidism: PTH: Parathyroid hormone; iPTH: Intact parathyroid hormone; EMG: Electromyography; Ca: Calcium; TFT: Thyroid function test; SPECT: Single photon emission computed tomography; iT-PA: Intrathyroid parathyroid adenoma; ETPG: Ectopic parathyroid gland; MIBI: Methoxyisobutylisonitrile; PHPT: Primary hyperparathyroidism