[1] BETH ISRAEL HOSP, HARVARD NEUROL DEPT, BULLARD LAB, BOSTON, MA 02215 USA
[2] BETH ISRAEL HOSP, HARVARD NEUROL DEPT, DENNY BROWN LAB, BOSTON, MA 02215 USA
[3] BETH ISRAEL HOSP, HARVARD NEUROL DEPT, BEHAV NEUROL SECT, BOSTON, MA 02215 USA
[4] BETH ISRAEL HOSP, CHARLES A DANA RES INST, BOSTON, MA 02215 USA
[5] HARVARD UNIV, SCH MED, DEPT NEUROBIOL, BOSTON, MA 02115 USA
[6] UNIV CHICAGO, JOSEPH P KENNEDY JR MENTAL RETARDAT RES CTR, DEPT PATHOL, CHICAGO, IL 60637 USA
[7] UNIV CHICAGO, JOSEPH P KENNEDY JR MENTAL RETARDAT RES CTR, DEPT PEDIAT, CHICAGO, IL 60637 USA