1 Unit of Internal Medicine, Department of Medical and Surgical Sciences, University of Bologna, S.Orsola-Malpighi Hospital, Bologna, Italy.
2 Department of Radiological Sciences, Policlinico Umberto I, University Sapienza, Rome, Italy.
3 Unit of Internal Medicine, Department of Medical and Surgical Sciences, University of Bologna, S.Orsola-Malpighi Hospital, Bologna, Italy. Electronic address: [email protected].