1. Emergency Observation Ward, The First People's Hospital of Lianyungang, Lianyungang, Jiangsu 222002, P.R. China
2. Emergency Medicine Department, The First People's Hospital of Lianyungang; 3Emergency Medicine Department, The First Affiliated Hospital of Kangda College of Nanjing Medical University, Lianyungang, Jiangsu 222002, P.R. China