1. Departments of Gerontology and Geriatrics (D.-K.L., B.W., X.-N.W.), Shenyang 110001, China
2. Departments of Gerontology and Geriatrics (X.-J.B., L.-L.H.), Sheng Jing Hospital, China Medical University, Shenyang 110004, China
3. Cardiac Function (J.Y.), the First Affiliated Hospital, China Medical University, Shenyang 110001, China
4. Department of Kidney (X.-M.C.), General Hospital of Chinese People's Liberation Army, Beijing 100853, China