1. Birmingham VA Medical Center, Birmingham, AL, USA
2. Department of PMR University of Alabama at Birmingham School of Medicine, Birmingham, AL, USA
3. Department of PMR Harvard School of Medicine, Boston, MA, USA
4. Department of Urology, Columbia University College of Physicians and Surgeons, New York, NY, USA
5. Emory University, Atlanta, GA, USA
6. Rancho Los Amigos National Rehabilitation Center, Downey, CA, USA
7. Department of Neurology, University of Southern California, Los Angeles, CA, USA