1. Department of Nuclear Medicine, Policlinico “S. Orsola-Malpighi,” Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.
2. Medical Physics Unit, Policlinico “S. Orsola-Malpighi,” Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.
3. Department of Nuclear Medicine, “S. Maria della Misericordia” Hospital, Rovigo, Italy.
4. Department of Nuclear Medicine, Hammersmith Hospital, London, United Kingdom.