[1] NINDS, Human Cort Physiol Sect, NIH, Bethesda, MD 20892 USA
[2] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Berenson Allen Ctr Noninvas Brain Stimulat, Boston, MA 02215 USA
[3] Columbia Univ, Dept Neurol, Motor Performance Lab, New York, NY USA
[4] Inst Neurol, London WC1N 3BG, England
[5] Med Univ Lubeck, Dept Neurol & Clin Neuroendocrinol, D-23538 Lubeck, Germany
[6] Univ Hamburg, Dept Neurol, Hamburg, Germany
[7] NINDS, Brain Stimulat Unit, NIH, Bethesda, MD 20892 USA
[8] Johns Hopkins Univ, Dept Phys Med & Rehabil, Baltimore, MD USA
[9] Univ Wurzburg, Dept Neurol, Human Cort Physiol & Motor Control Lab, D-8700 Wurzburg, Germany
[10] Univ Munster, Dept Neurol, D-4400 Munster, Germany
[11] IZKF Munster, Munster, Germany
[12] Univ Frankfurt, Dept Neurol, Frankfurt, Germany
[13] Univ Gottingen, Dept Clin Neurophysiol, Gottingen, Germany
[14] Univ Kiel, Dept Neurol, Brain Mapping Lab, D-2300 Kiel, Germany