1. Division of Cardiology, Cook County Health, Chicago, IL (S.M.).
2. Division of Cardiology, Rush Medical College, Chicago, IL (S.M.).
3. Krannert Institute of Cardiology, Indiana University Health Center, Indianapolis (O.B.).
4. Division of Cardiology, Duke University Medical Center, Durham, NC (P.D.).
5. Division of Cardiology (P.S.), University of Pittsburgh Medical Center, PA.
6. Heart and Vascular Institute (P.S.), University of Pittsburgh Medical Center, PA.