1. Division of Infectious Diseases, Department of Medicine, University of California, CHS 37-121, 10833 Le Conte Avenue, Los Angeles, California 90095-1688, United States
2. Department of Chemistry and Biochemistry, University of California, 3013 Young Drive East, Los Angeles, California 90095-1569, United States
3. California NanoSystems Institute, University of California, Los Angeles, California 90095-8352, United States