Sporadic medullary thyroid carcinoma: clinical data from a university hospital - Correia-Deur, Joya Emilie M.; Toledo, Rodrigo A.; Imazawa, Alice T.; Lourenço Junior, Delmar M.; Ezabella, Marilza C. L.; Tavares, Marcos R.; Toledo, S. P. A. (Clinics, 2009)