1. College of Information Science and Engineering, Hunan Normal University, Changsha, Hunan, China
2. Department of Geriatrics, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
3. Multidisciplinary Center for Infrastructure Engineering, Shenyang University of Technology, Shenyang, Liaoning, China
4. Information Center of Hunan Institute of Metrology and Test, Changsha, Hunan, China