How to optimize the incorporation of immunotherapy in trials for oligometastatic non-small cell lung cancer: a narrative review - Remon, Jordi; Menis, Jessica; Levy, Antonin; De Ruysscher, Dirk K. M.; Hendriks, Lizza E. L. (Translational Lung Cancer Research; Vol 10, No 7 (July 30, 2021): Translational Lung Cancer Research, 2021)