1 Center for Neurological Restoration, Cleveland Clinic Neurological Institute, Cleveland, OH, USA. Electronic address: liaoj2@ccf.org.
2 Department of Radiology, University of Michigan, Ann Arbor, MI, USA; Department of Neurology, University of Michigan, Ann Arbor, MI, USA; VA Ann Arbor Healthcare System, Ann Arbor, MI, USA. Electronic address: nbohnen@med.umich.edu.