1. Department of Internal Medicine, Immunology, and Infectious Diseases, Section of Internal Medicine, University of Bari Medical School, Bari, Italy
2. Department of Experimental Medicine and Pathology, University "La Sapienza," Rome, Italy
3. Department of Neurological Sciences, University "La Sapienza," Rome, Italy
4. Department of Neurosciences, "St. Camillo-Forlanini," Hospital, Rome, Italy