1. From the Department of Cardiology (S.W., C.J., X. Zheng, X. Zhang), Kailuan General Hospital, Tangshan, People’s Republic of China
2. Clinical Epidemiology Unit, Boston University School of Medicine, MA (S.L.)
3. Department of Nutritional Sciences, Pennsylvania State University, State College (X. Zhang, X.G.).
4. Department of Rheumatic Disease (L.C.), Kailuan General Hospital, Tangshan, People’s Republic of China