1. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
2. Center for Bio‐Integrated Electronics Simpson Querrey Institute for BioNanotechnology Northwestern University Evanston IL 60208 USA
3. School of Mechanical Engineering Kookmin University Seoul 02707 Republic of Korea
4. Epicore Biosystems Inc. Cambridge MA 02139 USA
5. Department of Neuroscience Northwestern University Evanston IL 60201 USA
6. Department of Biomedical Engineering University of Arizona Tucson AZ 85721 USA
7. School of Materials Science and Engineering Tsinghua University Beijing 100084 China
8. Quantitative Bio‐Element Imaging Center Northwestern University Evanston IL 60208 USA
9. Department of Mechanical and Process Engineering ETH Zurich CH‐8092 Zurich Switzerland
10. Department of Mechanical Engineering University of Hawai'i at Mānoa Honolulu HI 96822 USA
11. Department of Biomedical Engineering Northwestern University Evanston IL 60208 USA