Effects of high-dose opioid analgesia on survival, pain relief, quality of life and adverse drug reactions in cancer and neuropathic pain patients: a retrospective cohort study in real-world clinical practice

Xing Hao, Yiting Zhou, Yingxian Ling, Hirotsugu Miyoshi, Masahiko Sumitani, Kwok Ying Chan, Hue Jung Park, Zhiying Feng, Yuefeng Rao