1. The Heart and Vascular Institute; Cleveland Clinic; Cleveland Ohio
2. Cleveland Clinic Lerner College of Medicine of Case Western Reserve University School of Medicine; Cleveland Ohio
3. Department of Quantitative Health Sciences; Cleveland Clinic; Cleveland Ohio
4. University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
5. Division of Cardiology; Duke University; Durham North Carolina
6. Department of Pulmonary Medicine; Cleveland Clinic; Cleveland Ohio
7. Division of Cardiology; Hospital of the University of Pennsylvania; Philadelphia Pennsylvania
8. Division of Cardiology; Northwestern University Medical Center; Chicago Illinois
9. Department of Public Health Sciences; Division of Biostatistics; University of Miami; Miami Florida