[1] MONTREAL NEUROL INST & HOSP,DEPT NEUROL & NEUROSURG,MONTREAL H3A 2B4,QUEBEC,CANADA
[2] ROYAL VICTORIA HOSP,DEPT EXPTL MED,MONTREAL H3A 1A1,QUEBEC,CANADA
[3] MCGILL UNIV,FAC MED,MONTREAL H3A 2T5,QUEBEC,CANADA
[4] CTR STUDY REPROD,MONTREAL,QUEBEC,CANADA