1. Department of Emergency Medicine, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
2. Department of Geriatric Medicine, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
3. Medical College, Nantong University, Nantong, Jiangsu 226001, P.R. China