1. Department of Pediatrics (N.D.I., A.C., E.C., N.F., M.V., M.M.), Istituto Giannina Gaslini, University of Genova, 16147 Genova, Italy;
2. Department of Pediatrics (A.E.M.A., F.N.), 16147 Genova, Italy
3. Pediatric Neuroradiology (A.R.), 16147 Genova, Italy
4. Epidemiology, Biostatistics and Committee's Unit (F.B., R.H.), Istituto Giannina Gaslini, 16147 Genova, Italy