1. Southern Iron Disorders Center, Birmingham, Alabama.
2. Departments of Microbiology, Medicine, and Epidemiology and International Health, University of Alabama at Birmingham, Birmingham, Alabama.
3. Division of Gastroenterology, Department of Medicine, London Health Sciences Centre, London, Ontario, Canada.
4. Section of Biostatistics, Department of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina.
5. Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota.
6. Epidemiology Division, Department of Medicine, University of California, Irvine, California.
7. Department of Biostatistics and Epidemiology, University of Western Ontario, London, Ontario, Canada.
8. VA Long Beach Healthcare System, Long Beach, California.
9. Division of Epidemiology and Clinical Applications, National Heart, Lung, and Blood Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland.
10. Genetics Department, Kaiser Permanente Northwest, Portland, Oregon.