Older patients more likely to die from cancer-related diseases than younger with stage IA non-small cell lung cancer: a SEER database analysis - Ma, Haibo; Yao, Di; Cheng, Jiwei; Wang, Wei; Liu, Baoxing; Yu, Yongkui; Xing, Wenqun; Qin, Jianjun (Journal of Thoracic Disease, 2022)