1. Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
2. Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.
3. Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, USA.
4. Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA.
5. Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.