1. Department of Biomedical Engineering, Duke University, Durham, North Carolina
2. Visceral Neurophysiology Laboratory, College of Medicine and Public Health, Centre for Neuroscience, Flinders University, Adelaide, South Australia, Australia
3. Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina
4. Department of Neurobiology, Duke University, Durham, North Carolina
5. Department of Neurosurgery, Duke University, Durham, North Carolina