About the Authors

Veronica L. Irvin

Veronica.irvin@nih.gov

Affiliation Department of Rehabilitation Medicine, Clinical Research Center, National Institutes of Health, Bethesda, Maryland, United States of America

Robert M. Kaplan

Affiliation Department of Rehabilitation Medicine, Clinical Research Center, National Institutes of Health, Bethesda, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: VLI RMK. Performed the experiments: VLI. Analyzed the data: VLI. Contributed reagents/materials/analysis tools: RMK. Wrote the paper: VLI RMK.