[1] Beth Israel Deaconess Med Ctr, Lab Magnet Brain Stimulat, Behav Neurol Unit, Boston, MA 02215 USA
[2] Univ Autonoma Barcelona, Inst Guttmann, Hosp Neurorehabil, Barcelona 08916, Spain
[3] Univ Birmingham, Dept Behav Brain Sci, Sch Psychol, Birmingham B15 2TT, W Midlands, England