1. Department of Population Health Sciences (C.D.E.), University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53726-2397
2. Department of Preventive Medicine and Biometrics (T.E.F., J.M.N.), University of Colorado at Denver and Health Sciences Center, Denver, Colorado 80217-3364
3. Departments of Public Health Sciences (C.D.L., L.E.W.), Wake Forest University School of Medicine, Winston Salem, North Carolina 27103
4. Biochemistry and Center for Human Genomics (P.J.H., D.W.B.), Wake Forest University School of Medicine, Winston Salem, North Carolina 27103
5. Department of Public Health Sciences (S.S.R.), University of Virginia School of Medicine, Charlottesville, Virginia 22908