1. Department of Medicine, Creighton University School of Medicine, 7710 Mercy Rd Suite 202, Omaha, NE 68124, USA
2. Division of Cardiology, Department of Medicine, Creighton University School of Medicine, Omaha, NE, USA
3. Division of Clinical Research and Evaluative Sciences, Department of Medicine, Creighton University School of Medicine, Omaha, NE, USA
4. Division of Cardiology, Department of Medicine, University of Nebraska Medical Center, Omaha, NE, USA
5. Department of Cardiology, Mayo Clinic, Rochester, MN, USA
6. Division of Cardiology, Department of Medicine, Saint Luke's Mid America Heart Institute/University of Missouri-Kansas City, Kansas City, MO, USA