1. Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina.
2. Section of Otolaryngology-Head and Neck Surgery, Department of Surgery, The University of Chicago Medicine and Biological Sciences, Illinois.
3. Westat Inc, Durham, North Carolina.
4. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia.
5. California Pacific Medical Center Research Institute, San Francisco.
6. Department of Epidemiology, Graduate School of Public Health, University of Pittsburg, Pennsylvania.
7. Laboratory of Epidemiology, Demography, and Biometry, National Institute on Aging, Bethesda, Maryland.
8. University of Tennessee Health Science Center, Memphis.
9. Pennsylvania State University-Milton S. Hershey Medical Center.
10. Division of Geriatrics, Department of Medicine, University of Mississippi Medical Center, Jackson.
11. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing.