1. From the Department of Epidemiology, University of Alabama at Birmingham (P.M.)
2. Department of Medicine, University of Virginia, Charlottesville (R.M.C.)
3. Department of Medicine, University of Michigan, Ann Arbor (K.J.)
4. Department of Medicine, Case Western Reserve University, Cleveland, OH (J.T.W.)
5. Department of Epidemiology, Tulane University, New Orleans, LA (P.K.W.).