Lead Sponsor: Robert G. Grossman, MD

Collaborators: University of Miami, Medical College of Wisconsin, University of Virginia, Duke University, The Methodist Hospital Research Institute, Vanderbilt University Medical Center, University of Maryland, Baltimore, University of Toronto, The University of Texas Health Science Center, Houston, Thomas Jefferson University, University of Louisville, Louisiana State University Health Sciences Center in New Orleans, Walter Reed National Military Medical Center, Brooke Army Medical Center, Christopher Reeve Paralysis Foundation

Intervention / Treatment: OTHER: No Treatment Given