1. Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut.
2. DOD-VA Extremity Trauma and Amputation Center of Excellence, Walter Reed National Military Medical Center, Bethesda, Maryland.
3. Research and Development Section, Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, Maryland.
4. Regenerative Biosciences Laboratory, Department of Rehabilitation Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland.