The natural history of early onset multiple sclerosis: comparison of data from Moscow and Vancouver

data from Moscow and Vancouver Eugin Gusev , Alexei Boiko *, Olga Bikova , Olga Maslova , Maria Guseva , Svetlana Boiko , Galina Vorobeichik , Donald Paty c a Russian State Medical University, Baikalskaya 40/17, Apartment 277, Moscow 107207, Russia b Paediatric Institute of the Russian Academy of Medical Sciences, Moscow, Russia c Division of Neurology and MS Clinic, University of British Columbia, Vancouver, BC, Canada