BEIŠA, V., et al. “Parathyroidectomia: Treatment of Secondary Hyperparathyroidism. Causes and Prophylaxis of Disease Relapse”. Acta Medica Lituanica, vol. 18, no. 4, Oct. 2011, pp. 170-4, https://doi.org/10.6001/actamedica.v18i4.1870.