[1] YALE UNIV, SCH MED, DEPT NEUROL, NEW HAVEN, CT 06510 USA
[2] YALE UNIV, SCH MED, DEPT HUMAN GENET, NEW HAVEN, CT 06510 USA
[3] HARVARD UNIV, CHILDRENS HOSP, SCH MED, DEPT NEUROL, BOSTON, MA 02115 USA
[4] HARVARD UNIV, SCH MED, PROGRAM NEUROSCI, BOSTON, MA 02115 USA
[5] HARVARD UNIV, CHILDRENS HOSP, SCH MED, DIV GENET, BOSTON, MA 02115 USA
[6] HARVARD UNIV, SCH MED, DEPT PEDIAT, BOSTON, MA 02115 USA