1. From the Department of Preventive Medicine, School of Public Health, North China University of Science and Technology, Tangshan (Y. Li)
2. Departments of Cardiology (Z.H., C.J., A.X., S.W.)
3. Neurology (Y. Liu, C.H.), Kailuan General Hospital, Tangshan, China
4. Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA (A.H.L.)
5. Clinical Laboratory and Nutritional Sciences, University of Massachusetts Lowell (K.L.T.)
6. Departments of Nutritional Sciences, The Pennsylvania State University, State College (X.G.).