1. Department of Anesthesiology, West China Hospital of Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. Department of Anesthesiology, The Second Affiliated Hospital of Sun Yat‑Sen University, Guangzhou, Guangdong 510085, P.R. China
3. Department of Anesthesiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China