[1] MONTREAL NEUROL INST & HOSP,MONTREAL H3A 2B4,QUEBEC,CANADA
[2] MCGILL UNIV,DEPT NEUROL,MONTREAL 101,QUEBEC,CANADA
[3] MCGILL UNIV,DEPT NEUROSURG,MONTREAL 101,QUEBEC,CANADA
[4] COLUMBIA UNIV,BARNARD COLL,H HOUSTON MERRITT CLIN RES CTR MUSCULAR DYSTROPHY & RELATED DIS,NEW YORK,NY 10027
[5] PRESBYTERIAN HOSP,INST NEUROL,NEW YORK,NY 10032