1. From the Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yet-Sen University, Guangzhou, China (T.X., X.Z., L.-J.Z., X.-H.W., X.-G.L.); Department of Anesthesiology and Intensive Care, Changhai Hospital, Second Military Medical University, Shanghai, China (D.L.); Department of Anesthesiology, State Key Laboratory of Oncology in Southern China, Sun Yat-Sen Unive