1. Electrical Engineering and Computer Sciences; University of California; Berkeley CA 94720 USA
2. Berkeley Sensor and Actuator Center; University of California; Berkeley CA 94720 USA
3. Materials Sciences Division; Lawrence Berkeley National Laboratory; Berkeley CA 94720 USA
4. Stanford Genome Technology Center; Stanford School of Medicine; 3165 Porter Drive Palo Alto CA 94304 USA
5. Mechanical Engineering; Tianjin University; 92 Weijin Road Nankai, Tianjin 300072 P.R. China
6. Bioengineering; University of California; Berkeley CA 94720 USA
7. Material Science and Engineering; University of California; Berkeley CA 94720 USA
8. Neurological Surgery; University of California; San Francisco 1001 Potrero Avenue CA 94110 USA