[1] Massachusetts Gen Hosp, Mol Neurogenet Unit, Charlestown, MA 02129 USA
[2] Harvard Univ, Sch Med, Dept Genet, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Dept Neurol, Boston, MA 02115 USA
[4] Harvard Univ, Sch Med, Program Neurosci, Boston, MA 02115 USA
[5] Reg Gen Hosp, Dept Neurol, Bolzano Bozen, Italy
[6] Reg Gen Hosp, Dept Genet, Bolzano Bozen, Italy
[7] Oregon Hlth Sci Univ, Dept Neurogenet, Portland, OR 97201 USA