1. Departments of Medicine and Electrical and Electronic Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
2. Department of Clinical Neurosciences, St Vincent's Hospital, 41 Victoria Parade Fitzroy, Victory 3065, Australia
3. Department of Clinical Neurosciences, St Vincent's Hospital, Fitzroy, Australia
4. Bionics Institute, East Melbourne, Victoria, Australia
5. Department of Medicine, The University of Melbourne, Parkville, Victoria 3010, Australia