Functional cortical changes in patients with multiple sclerosis and nonspecific findings on conventional magnetic resonance imaging scans of the brain. - Maria Assunta Rocca; Elisabetta Pagani; Angelo Ghezzi; Andrea Falini; Mauro Zaffaroni; Bruno Colombo; Giuseppe Scotti; Giancarlo Comi; Massimo Filippi (NeuroImage, 2003)