Married women who keep quiet during conflicts with their mates greatly boost their risk of dying from any cause, a new study finds.And married men whose wives come home upset about work are at increased risk of developing heart disease, the same research finds.The results were presented Feb. 17 at the Second International Conference on Women, Heart Disease and Stroke in Orlando, Fla. The meeting was sponsored by the American Heart Association, the U.S. Centers for Disease Control and Prevention and other organizations.Elaine D. Eaker, who heads an independent research firm in Wisconsin, worked with colleagues from Boston University to analyze marital discord and its effect on heart disease and overall mortality.