1. Department of Endocrinology, World Health Organization Collaborating Center for the Diagnosis and Treatment of Thyroid Carcinoma and Other Thyroid Diseases, Centro Eccellenza AmbiSEN (F.L., D.R., L.M., R.R., P.P., E.S., L.G., A.P., P.V.); 56124 Pisa, Italy
2. Department of Oncology, Section of Pathology 3 (F.B., C.U.), University of Pisa, 56124 Pisa, Italy