1 Unit of Internal Medicine, Department of Medicine., University of Perugia, Piazzale L. Severi, 1, 06132 Perugia, Italy. Electronic address: matteo.pirro@unipg.it.
2 Unit of Internal Medicine, Department of Medicine., University of Perugia, Piazzale L. Severi, 1, 06132 Perugia, Italy.