[1] MCGILL UNIV, DEPT NEUROL & NEUROSURG, MONTREAL H3A 2T5, QUEBEC, CANADA
[2] MCGILL UNIV, DIV ENDOCRINOL, MONTREAL H3A 2T5, QUEBEC, CANADA
[3] MONTREAL GEN HOSP, MONTREAL H3G 1A4, QUEBEC, CANADA
[4] QUEENS UNIV, DIV NEUROL, KINGSTON K7L 3N6, ONTARIO, CANADA