1. Department of Emergency, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, Qingdao, P.R. China
2. Department of Emergency, Weihai Municipal Hospital, Weihai, P.R. China
3. Emergency Department, Qingdao Municipal Hospital (Group), Qingdao NO.9 People’s Hospital, Qingdao, P.R. China
4. Department of Cardiology, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, Qingdao, P.R. China
5. Department of Geriatrics, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, Qingdao, P.R. China