1. Unit of Thyroid Pathology "Villa Cinzia," Naples, Italy.
2. Department of Internal Medicine, Endocrinology Unit, Fondazione S. Maugeri I.R.C.C.S, Pavia, Italy.
3. Department of Pathology, Ospedale San G. Moscati Avellino, Italy.
4. Department of Clinical and Experimental Medicine and Surgery "F. Magrassi–A. Lanzara," Second University of Naples, Italy.