Safety and acceptability of clozapine and risperidone in progressive multiple sclerosis: a phase I, randomised, blinded, placebo-controlled trial oleh Sean Lance, Anne C La Flamme, David Abernethy, Dalice Sim, Liz Goode, Michelle Lockhart, David Bourke, Imogen Milner, Toni-Marie Garrill, Purwa Joshi, Eloise Watson, Duncan Smyth, Bronwen Connor