1. School of Speech, Language, and Hearing Sciences, San Diego State University, San Diego, California
2. Epidemiology and Statistics Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, Maryland
3. Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
4. Division of Infectious Diseases, Department of Medicine, Georgetown University Medical Center, Washington, District of Columbia
5. Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland