1. Berenson-Allen Center for Noninvasive Brain Stimulation, Division of Cognitive Neurology, Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
2. Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
3. Institut Guttman, Universitat Autonoma de Barcelona, Badalona, Barcelona, Spain