Ling Wang1, Wei-Qi Nian1, Wan-Yan Tang1, Jia-Xi Tang2. 1. Department of Phase I Clinical Trial Ward, Chongqing University Cancer Hospital, Chongqing, China. 2. Department of Anesthesiology, Chongqing University Cancer Hospital, Chongqing, China. Electronic address: tangjiaxi1029@126.com.