Construction and validation of a predictive model for the risk of prolonged preoperative waiting time in patients with intertrochanteric fractures - Gong, Rui; Jin, Xi-min; Xu, Lian-you; Zhang, Zhi-meng; Yuan, Dao-tong; Xie, Wen-peng; Zhang, Yong-kui (Frontiers in Medicine, 2025)