1 Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA.
2 Stanford Center for Clinical Research, Stanford University, Stanford, CA, 94305, USA.
3 Quantitative Sciences Unit, Stanford University, Stanford, CA, 94305, USA.
4 Neuronic Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
5 Department of Radiology, Stanford University, Stanford, CA, 94305, USA.
6 Department of Neurosurgery, Pediatric Neurosurgery, Stanford University, 300 Pasteur Dr Room R211, MC 5327, Stanford, CA, 94305, USA. ggrant2@stanford.edu.