1 Department of Neurology, Division of Neurocritical Care and Stroke Service, Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Harvard Medical School, Boston.
2 Department of Veterans Affairs, Rehabilitation Research and Development Service, Center for Neurorestoration and Neurotechnology, Providence, Rhode Island.
3 Department of Rehabilitation and Regenerative Medicine, Columbia University, New York, New York.
4 Department of Rehabilitation Medicine, Weill Cornell Medical College, New York, New York.