[1] JOHN F KENNEDY INST HANDICAPPED CHILDREN, BALTIMORE, MD USA
[2] YESHIVA UNIV ALBERT EINSTEIN COLL MED, SAUL R KOREY DEPT NEUROL, BRONX, NY 10461 USA
[3] YESHIVA UNIV ALBERT EINSTEIN COLL MED, DEPT PATHOL, BRONX, NY 10461 USA
[4] YESHIVA UNIV ALBERT EINSTEIN COLL MED, ROSE F KENNEDY CTR RES MENTAL RETARDAT & HUMAN DEV, BRONX, NY 10461 USA