Department of Electrical Engineering, Stanford University, Stanford, CA, United States of America.|Department of Computer Science, Stanford University, Stanford, CA, United States of America.|Department of Bioengineering, Stanford University, Stanford, CA, United States of America.|Department of Neurosurgery, Palo Alto Medical Foundation, Palo Alto, CA, United States of America.|Department of Electrical Engineering, Stanford University, Stanford, CA, United States of America.