1. Department of Cardiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
2. Roudebush Veterans Affairs Medical Center, Indianapolis, IN 46202, USA
3. Department of Rehabilitation, Indiana University Health, Indianapolis, IN 46202, USA
4. Columbia, MO, USA
5. Milton S Hershey Medical Center, Pennsylvania State University, PA 17033, USA
6. Richard M Fairbanks School of Public Health, Indianapolis, IN 46202, USA