1. Division of Endocrinology, “V. Fazzi” Hospital, Lecce, Italy.
2. Division of Endocrinology and Metabolism, Mauriziano Hospital Umberto I, Turin, Italy.
3. United Technologies Research Center, Trento, Italy.
4. Department of Nuclear Medicine and Thyroid Centre, Ente Ospedaliero Cantonale, Bellinzona, Switzerland.