1. From the Division of Cardiology, Department of Medicine (R.A.Q., W.R.T.), Emory University School of Medicine, Atlanta, GA
2. Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology (W.R.T.), Emory University School of Medicine, Atlanta, GA
3. Division of Cardiology, Atlanta VA Medical Center, Decatur, GA (W.R.T.).