1. Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
2. Department of Infectious Disease, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230000, P.R. China
3. Ambulatory Surgery Center, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China