1. Department of Cardiovascular Medicine, Northeast Ohio Medical University, Rootstown, OH, USA
2. Department of Cardiovascular Medicine, Cleveland Clinic Akron General, Akron, OH, USA
3. Department of Cardiovascular Medicine, Allegheny General Hospital, Pittsburgh, PA, USA
4. Department of Cardiovascular Medicine, Drexel University College of Medicine, Pittsburgh, PA, USA
5. Department of Cardiovascular Medicine, Sharon Regional Health System, Sharon, PA, USA