1. Department of Epidemiology; Bloomberg School of Public Health; Johns Hopkins University; Baltimore MD USA
2. David Geffen School of Medicine; University of California; Los Angeles CA USA
3. Los Angeles Biomedical Research Institute at Harbor-UCLA; Torrance CA USA
4. Department of Epidemiology; UCLA School of Public Health; Los Angeles CA USA
5. Department of Infectious Diseases and Microbiology; Graduate School of Public Health; University of Pittsburgh; Pittsburgh PA USA
6. TriCore Reference Laboratory; Albuquerque NM USA
7. Division of Infectious Diseases; Feinberg School of Medicine; Northwestern University; Chicago IL USA
8. Department of Medicine; Johns Hopkins University; Baltimore MD USA