1. Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States
2. Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
3. Department of Medicine, Northwestern University, Chicago, Illinois 60611, United States
4. Biomaterials for Neural Regeneration, Institute for Bioengineering of Catalonia (IBEC), Barcelona 08028, Spain
5. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
6. Centro de Fisica de Materiales (CFM), CSIC-UPV/EHU, San Sebastián 20018, Spain
7. The Ken & Ruth Davee Department of Neurology, Department of Physiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, United States
8. Department of Pathology and Experimental Therapeutics, Institute of Neurosciences, University of Barcelona, L’Hospitalet de Llobregat, Barcelona 08907, Spain
9. Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, United States
10. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States