[1] Univ Med Ctr Hamburg Eppendorf, Dept Neurol, Brain Imaging & Neurostimulat Lab, D-20246 Hamburg, Germany
[2] Johns Hopkins Univ, Dept Neurol, Dept Phys Med & Rehabil, Baltimore, MD 21218 USA
[3] Harvard Univ, Sch Med, Berenson Allen Ctr Noninvas Brain Stimulat, Boston, MA USA
[4] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA
[5] Univ Auckland, Movement Neurosci Lab, Dept Sport & Exercise Sci, Auckland 1, New Zealand
[6] W Virginia Univ, Dept Physiol, Dept Neurol, Morgantown, WV 26506 USA
[7] NINDS, Human Cort Physiol Sect, NIH, Bethesda, MD 20892 USA
[8] NINDS, Stroke Neurorehabil Clin, NIH, Bethesda, MD 20892 USA