This study analyzed data from three previous multiyear studies that surveyed nearly 400,000 subjects. The finding challenged claims repeated in medical literature that half of those who suffer heart-related events do not have any of the risk factors.
However, it is my belief that the prominent Northwestern physician who authored the study neglected to include the most common contributing factor to heart disease, and for that matter, cancer--and that is, unresolved emotional stresses.
JAMA August 20, 2003;290:891-897 Free Full Text Article