Effects of dexmedetomidine-ropivacaine assisted combined spinal-epidural anesthesia on neutrophil-lymphocyte ratio and postoperative delirium in elderly patients with intertrochanteric femoral fracture - Bai, Lili; Zhao, Lina; Jia, Fang; Liu, Ying; Li, Ping (Frontiers in Pharmacology, 2025)