[1] Kyoto Min Iren Cent Hosp, Kansai Multiple Sclerosis Ctr, Kyoto, Japan
[2] Juntendo Univ, Sch Med, Dept Neurol, Tokyo, Japan
[3] Kyushu Univ, Dept Neurol, Fukuoka, Japan
[4] Biogen, Clin Dev, Tokyo, Japan
[5] Biogen, Biostat, Maidenhead, Berks, England
[6] Biogen, Clin Dev, Cambridge, MA USA