Associations Among Self-reported Physical Activity, Coronary Artery Calcium Scores, and Mortality Risk in Older Adults oleh Alan Rozanski, MD, Yoav Arnson, MD, Heidi Gransar, MS, Sean W. Hayes, MD, John D. Friedman, MD, Louise E.J. Thomson, MBChB, Damini Dey, PhD, Daniel S. Berman, MD