1 Division of Internal Medicine, Department of Medical and Surgical Sciences, University of Bologna S.Orsola-Malpighi Hospital, Bologna, Italy. Electronic address: fabio.piscaglia@unibo.it.
2 Division of Internal Medicine, Department of Medical and Surgical Sciences, University of Bologna S.Orsola-Malpighi Hospital, Bologna, Italy.
3 Division of General and Transplant Surgery, Department of Medical and Surgical Sciences, University of Bologna S.Orsola-Malpighi Hospital, Bologna, Italy.