1. Department of Physical Medicine & Rehabilitation; School of Medicine; University of California; Davis, 4860 Y Street, Suite 3850; Sacramento; California; 95817; USA
2. Department of Neurology; Kennedy Krieger Institute; Baltimore; Maryland; USA
3. Department of Neurology; Washington University; St. Louis; Missouri; USA
4. Center for Genetic Medicine Research; Children*#x00027;s National Medical Center; Washington; DC; USA
5. Department of Neurology; University of Pittsburgh and Department of Veterans Affairs Medical Center; Pittsburgh; Pennsylvania; USA