Causes of hypercalcemia in renal transplant recipients: persistent hyperparathyroidism and others - Moysés Neto, Miguel; Garcia, T. M. P.; Nardin, M. E. P.; Muglia, Valmir Aparecido; Molina, Carlos Augusto Fernandes; Romão, Elen Almeida (Brazilian Journal of Medical and Biological Research, 2021)