1 Department of Medical and Surgical Sciences and Advanced Technologies 'G.F. Ingrassia', Section of Neurosciences, University of Catania, Catania, Italy.
2 Italian Society of General Medicine (SIMG), Catania, Italy.
3 INSERM, U1094, Tropical Neuroepidemiology, Limoges, France; Univ. Limoges, UMR_S 1094, Tropical Neuroepidemiology, Institute of Neuroepidemiology and Tropical Neurology, CNRS FR 3503 GEIST, Limoges, France; CHU Limoges, Centre d'Epidemiologie de Biostatistique et de Methodologie de la Recherche, Limoges, France.
4 Department of Experimental and Clinical Medicine, Infectious and Tropical Diseases Unit, University of Florence, Florence, Italy.