[1] COLUMBIA UNIV,COLL PHYS & SURG,DEPT MICROBIOL,NEW YORK,NY 10032
[2] COLUMBIA UNIV,COLL PHYS & SURG,DEPT NEUROL,NEW YORK,NY 10032
[3] COLUMBIA UNIV,COLL PHYS & SURG,DEPT HUMAN GENET & DEV,NEW YORK,NY 10032
[4] PRESBYTERIAN HOSP,NEUROL INST,NEW YORK,NY