1. Department of Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA.
2. Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
3. California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA.
4. Department of Surgery, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.