1. School of Social Ecology and Division of Infectious Diseases; University of California at Irvine; Irvine; California
2. Los Angeles Biomedical Research Institute at Harbor, University of California at Los Angeles Medical Center; Torrance; California
3. Division of Infectious Diseases and Health Policy Research Institute; University of California at Irvine; Irvine; California
4. Department of Pathology and Laboratory Medicine, School of Medicine; University of California at Irvine; Irvine; California