1. Department of Epidemiology, University of Washington, Seattle, Washington, USA
2. Department of Global Health, University of Washington, Seattle, Washington, USA
3. Center for AIDS and STD, University of Washington, Seattle, Washington, USA
4. Division of Infectious Diseases, Johns Hopkins University, Baltimore, Maryland, USA
5. Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA
6. Department of Medicine, University of Alabama, Birmingham, Birmingham, Alabama, USA
7. Department of Epidemiology, University of Alabama, Birmingham, Birmingham, Alabama, USA
8. Department of Microbiology, University of Alabama, Birmingham, Birmingham, Alabama, USA
9. UCLA Division of Infectious Diseases, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
10. Hologic, Inc., San Diego, California, USA