1. Horae Gene Therapy Center, University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA 01605, USA.
2. Shire, 125 Binney Street, Cambridge, MA 02142, USA.
3. Department of Neurology, University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA 01605, USA.
4. Department of Pediatrics, University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA 01605, USA.