1. From the Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, People’s Republic of China (J.X., Y.-W.F., W.W., X.-X.Z., X.-H.W., X.-G.L.); Guangdong Provincial Key Laboratory of Brain Function and Disease, Guangzhou, Guangdong, People’s Republic of China (X.-H.W., X.-G.L.); and Department of Anesthesiology, Guangzhou Hospit