Concussions are becoming increasingly common, especially among school-age athletes. It has been estimated that there are up to 3.8 million sports-related concussions in the United States each year. Concussions are problematic as, by definition, a concussive injury involves some degree of trauma to the

Chronic disease is a major problem in U.S. health care. More than one-third of Americans have one or more chronic diseases, including heart disease, diabetes, and cancer. The personal costs to patients and families are often severe, daily, and ongoing. The economic costs to society are almost $1 trillion