1. Department of Anesthesiology, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan 646000, P.R. China
2. Department of Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan 646000, P.R. China
3. Dean's Office, South West Medical University, Luzhou, Sichuan 646000, P.R. China