1. Department of Physical Medicine and Rehabilitation, Ohio State University, Columbus Ohio.
2. Research Department, Craig Hospital, Englewood, Colorado.
3. Moss Rehabilitation Research Institute, Albert Einstein Healthcare Network, Elkins Park, Pennsylvania.
4. Department of Rehabilitation Medicine, Icahn School of Medicine at Mount Sinai, New York, New York.
5. National Center for Injury Prevention and Control at the Centers for Disease Control and Prevention, Atlanta, Georgia.