1. Human Motor Control Section, Medical Neurology Branch; National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health (NIH); Bethesda Maryland USA
2. Experimental Neurophysiology Unit; Institute of Experimental Neurology (INSPE), San Raffaele Scientific Institute; Milan Italy
3. Research and Development Department; Meridian Medical Technologies, Inc.; Columbia Maryland USA
4. Departments of Neurology and Pediatrics; Johns Hopkins University School of Medicine; Baltimore Maryland USA