1 Neurology Unit, Guglielmo da Saliceto Hospital, Piacenza, Italy; Radiology Unit, Guglielmo da Saliceto Hospital, Piacenza, Italy. Electronic address: nicola.morelli.md@gmail.com.
2 Neurology Unit, San Giacomo Hospital, Novi Ligure, Alessandria, Italy.
3 Radiology Unit, Guglielmo da Saliceto Hospital, Piacenza, Italy.
4 Medical Physics Unit, Guglielmo da Saliceto Hospital, Piacenza, Italy.
5 Neurology Unit, Guglielmo da Saliceto Hospital, Piacenza, Italy.