1. Vanderbilt Genetics Institute (J.H.B., M.M.S., T.L.E., J.N.H.), Vanderbilt University Medical Center, Nashville, TN.
2. Division of Genetic Medicine, Department of Medicine (M.M.S., J.N.H.), Vanderbilt University Medical Center, Nashville, TN.
3. Division of Epidemiology, Department of Medicine (T.L.E.), Vanderbilt University Medical Center, Nashville, TN.