1. Division of Cardiovascular Medicine, University of Kentucky, Lexington (E.J.B.).
2. Division of Cardiovascular Medicine, University of Louisville, KY (E.J.B.).
3. Department of Medicine, Jefferson University Hospital, Philadelphia, PA (J.E.R.).
4. Clinical Trials Unit, University of Louisville, KY (C.C.).
5. Division of Cardiovascular Medicine, University of Utah, Salt Lake City (S.G.D.).