1. Department Nuclear Medicine, Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Milan, Italy.
2. Department of Endocrinology, Ospedale San Pio X, Milan, Italy.
3. Department of Health Physics, Azienda Ospedaliera Maggiore della Caritá, Novara, Italy.
4. Department of Endocrinology, Ospedale Fatebenefratelli, Milan, Italy.