1. University of Bologna, Department of Experimental, Diagnostic and Specialty Medicine, Bologna, Italy
2. University Hospital “S.Orsola – Malpighi,” Department of Medical Physics, Bologna, Italy
3. European Organization for Nuclear Research (CERN), Geneva, Switzerland
4. University Hospital “S.Orsola – Malpighi,” Department of Clinical Engineering, Bologna, Italy
5. University of Bologna, Department of Industrial Engineering, Bologna, Italy