1. Internal Medicine, Bentivoglio Hospital, AUSL Bologna, Bentivoglio (BO), 40010 Bologna, Italy
2. Department of Medicine and Aging Science, Institute of “Clinica Medica”, “G. d’Annunzio” University, 66100 Chieti, Italy
3. Department of Internal Medicine, Bologna University, 40138 Bologna, Italy
4. Department of Medical, Surgical and Experimental Sciences, University of Sassari, 07100 Sassari, Italy
5. Internistic Ultrasound Unit, SS Annunziata Hospital, “G. d’Annunzio” University, 66100 Chieti, Italy
6. Internal Medicine, Centre of Research and Learning in Ultrasound, Maggiore Hospital, 40133 Bologna, Italy