[1] MEMORIAL SLOAN KETTERING CANC CTR,DEPT NEUROL,NEW YORK,NY 10021
[2] CORNELL UNIV,NEW YORK HOSP,MED CTR,DEPT NEUROL,NEW YORK,NY 10021
[3] BROOKHAVEN NATL LAB,MED RES CTR,DEPT NEUROL,UPTON,NY 11973
[4] MEMORIAL SLOAN KETTERING CANC CTR,BIOSTAT LAB,NEW YORK,NY 10021