J. Yan, Z.- zheng Xie, N. Ma, M.- dong Zheng, T.- ting Qiao, and Y. Wang, “Effects of oxycodone hydrochloride sustained-release tablets and morphine hydrochloride sustained-release tablets on peripheral blood T cell levels in advanced lung squamous cell carcinoma with moderate to severe cancer pain”, Pak J Med Sci, vol. 39, no. 5, Aug. 2023.