1. Division of Cardiology, Department of Medicine, University of California, Irvine, California, USA.
2. Division of Cardiology, Department of Medicine, University of Texas at Houston, Houston, Texas, USA.
3. Division of Cardiology, Department of Medicine, Albany Medical Center, Albany, New York, USA.
4. Schaffer Library of Health Sciences, Albany Medical College, Albany, New York, USA.
5. Division of Cardiology, Department of Medicine, Rush College of Medicine, Chicago, Illinois, USA.