1. Neurological Clinical Research Institute; Massachusetts General Hospital; 165 Cambridge Street, Suite 600, Boston Massachusetts 02114 USA
2. Department of Physical Medicine and Rehabilitation; Spaulding Rehabilitation Hospital; Boston Massachusetts USA
3. Department of Neurology; Penn State Hershey Medical Center; Hershey Pennsylvania USA
4. Department of Humanities; Penn State Hershey Medical Center; Hershey Pennsylvania USA