Single-dose dexamethasone increases perioperative glycemic variability in older patients with diabetes undergoing lung surgery: a continuous glucose monitoring-based randomized controlled trial - Xiaoyi Zhang; Cheng Huang; Xiang Wang; Jun Zhang; Xiaomei Ling; Jiahao Xu; Jue Ma; Fei Zhong; Haihua Shu (Frontiers in Medicine, 2026)