Prognostic value of pretherapy CT-based Node-RADS for overall survival in extensive-stage small cell lung cancer treated with chemoimmunotherapy: a comparison with clinical N staging - Sun, Yan; Zhang, Yi; Yu, Sanqiang; Wen, Lu; Yang, Yanhui; Fu, Yi; Tang, Genyan; Jiang, Sishi; Wang, Ruoxi; Yu, Xiaoping (Quantitative Imaging in Medicine and Surgery, 2026)