1. From the Departments of Cardiology (A.J.T.) and General Internal Medicine (P.G.O.), Walter Reed Army Medical Center, Washington, DC; Louisiana State University Medical Center (G.T.M.), New Orleans, La; the Department of Pathology (J.S.), University of Maryland, Baltimore; and the Cardiovascular Division (A.P.B., A.F., R.V.), Armed Forces Institute of Pathology, Washington, DC.