vi. Hypoparathyroidism Serum calcium, phosphorus, albumin and intact parathyroid hormone will be measured in every patient, 24 hours after surgery. Patients with a corrected calcium ≥7.5 mg/dl and no symptoms of hypocalcemia will receive no calcium supplements and no further blood tests will be obtained. In patients with symptoms (tingling trembling, parenthesis, tetanic, and cardiac manifestations) and/or corrected calcium <7.5 mg/dl. Ca supplements will be administered and calcium / phosphorus / albumin will be measured every 2 weeks until supplements have been weaned. In the case that hypocalcemia persisted for 3 months, calcium/ phosphorus / albumin will be measured monthly up to 6 months. Transient hypoparathyroidism will be considered if hypocalcemia recovers in less than 6 months and the diagnosis of permanent hypoparathyroidism will be established if hypocalcemia persists for more than 6 months. Differences will be analyzed using the Fisher´s exact test