Intrathecal morphine delivery at prepontine cistern to control refractory cancer-related pain: a case report of extensive metastatic and refractory cancer pain. - Li, Qing; Long, Yan-ling; He, Yun-wu; Long, Hui; Xiao, Zhen-ping; Li, Yong-lin; Yang, Wu-zhou; Jiang, Li-ping; Gao, Wei; Zou, Cong (BMC Anesthesiology, 2024)