[1] COLUMBIA UNIV,COLL PHYS & SURG,DEPT HUMAN GENET & DEV,NEW YORK,NY 10032
[2] PRESBYTERIAN HOSP,NEUROL INST,NEW YORK,NY 10032
[3] NORTHWESTERN UNIV,DEPT ENGN SCI,EVANSTON,IL 60201
[4] NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60201
[5] COLUMBIA UNIV,COLL PHYS & SURG,DEPT MICROBIOL,NEW YORK,NY 10032
[6] COLUMBIA UNIV,COLL PHYS & SURG,DEPT NEUROL,NEW YORK,NY 10032