Song Lyu,1 Guobin Wu,2 Yingfen Wu1 1Department of Anesthesiology, The Second Affiliated Hospital of Hainan Medical University, Haikou, People’s Republic of China; 2Medical Record Management Department, The Second Affiliated Hospital of Hainan Medical University, Haikou, People’s Republic of China Correspondence: Song Lyu, Department of Anesthesiology, The Second Affiliated Hospital of Hainan Medical University, Haikou, People’s Republic of China, Fax +8689866808208, Email [email protected]...