1. Unit of Internal Medicine, Dpt of Medical and Surgical Sciences, University of Bologna, Italy
2. Department of Radiological Sciences, Oncology and Pathology, Policlinico Umberto I, Univ. Sapienza, Rome, Italy.
3. Unit of Internistic Ultrasound, Dpt of Medicine and Science of Aging, "G. d'Annunzio" University, Chieti, Italy.