The prospect of immunotherapy combined with chemotherapy in patients with advanced non-small cell lung cancer: a narrative review - Ning, Xiangu; Yu, Yang; Shao, Songjun; Deng, Rong; Yu, Jie; Wang, Xuming; She, Xueke; Huang, Depei; Shen, Xudong; Duan, Weiming; Duan, Jin; Zhang, Hushan (Annals of Translational Medicine, 2021)