Surgery vs. radiotherapy in a population-based cohort of elderly patients with early-stage small-cell lung cancer: an IPTW propensity-score analysis - Liu, Lipin; Li, Runze; Peng, Yue; Zhang, Tao; Qiu, Bin (Journal of Thoracic Disease; Vol 15, No 5 (May 30, 2023): Journal of Thoracic Disease, 2023)