1. Richard A and Susan F Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
2. Department of Cardiovascular Medicine, Saint Luke’s Mid America Heart Institute, Kansas City, MO, USA
3. Harvard Medical School, Boston, MA, USA
4. Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA