1. Inova Center of Outcomes Research, Inova Heart and Vascular , 3300 Gallows Road, Falls Church, VA 22042 , USA
2. Department of Medicine, Yale School of Medicine , 333 Cedar St., New Haven, CT 06510 , USA
3. Department of Cardiovascular Medicine, Brigham and Women’s Hospital , 75 Francis St., Boston, MA 02115 , USA
4. Department of Medicine, Division of Cardiology, Yale University School of Medicine , 333 Cedar St., New Haven, CT 06510 , USA
5. Division of Critical Care, University of Alberta , 116 St. and 85 Ave, Edmonton, AB T6G 2R3, CA
6. Department of Medicine, Division of Cardiology, Johns Hopkins University School of Medicine , 733 N Broadway, Baltimore, MD 21205 , USA