1. Endocrinology Unit, Dept. of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy.
2. Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands.
3. Academic Center for Thyroid Diseases, Erasmus Medical Center, Rotterdam, The Netherlands.
4. Erasmus MC Bone Center, Erasmus Medical Center, Rotterdam, The Netherlands.