J Neurol 2011 Sep 12;258(9):1610-23. Epub 2011 Mar 12.
Department of Neurological Sciences, Dino Ferrari Centre, University of Milan, I.R.C.C.S. Foundation Ca' Granda, Ospedale Maggiore Policlinico, Padiglione Ponti, Via Francesco Sforza 35, 20122 Milan, Italy.