[1] Department of Bioengineering, Stanford University, Stanford, CA
[2] Department of Chemical Engineering, Stanford University, Stanford, CA
[3] Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA
[4] Department of Chemistry, Stanford University, Stanford, CA
[5] Department of Materials Science and Engineering, Stanford University, Stanford, CA
[6] Stanford Stroke Center and Stanford University School of Medicine, Stanford, CA
[7] Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon