1 Department of Biomedical and Clinical Sciences, University of Milan, ASST Fatebenefratelli-Sacco, Milan, Italy.
2 Department of Internal Medicine, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy.
3 Department of Internal Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.
4 Department of Advanced Medical and Surgical Sciences, University of Campania "Luigi Vanvitelli", Piazza Luigi Miraglia 2, 80138, Naples, Italy. alfredo.caturano@virgilio.it.