Radical local treatment for stage IV non-small cell lung cancer in older adults: a propensity-score matched analysis of the SEER database - Qiu, Chenhui; Zhang, Shaotang; Jin, Hualiang; Zhang, Xiaoqin; Ye, Jian (Translational Cancer Research; Vol 9, No 9 (September 24, 2020): Translational Cancer Research, 2020)