1. Sezione di Neurofisiologia Clinica, Dipartimento di Scienze Neurologiche e del Comportamento, Universita' di Siena, Siena, Italy
2. INSERM, UMRS 731, Paris, France
3. Universite Pierre et Marie Curie – Paris 6, UMRS 731, Paris, France
4. NITLAB, Bioengineering Department, Politecnico di Milano, Milano, Italy
5. Centro di Riabilitazione “Villa Beretta”, Ospedale Valduce, Lecco, Italy
6. Human Cortical Physiology Section and Stroke Neurorehabilitation Clinic, National Institute of Neurological Disorders & Stroke, National Institutes of Health, Bethesda, MD, USA