Stereotactic radiotherapy for early stage non-small cell lung cancer: current standards and ongoing research - Vlaskou Badra, Eugenia; Baumgartl, Michael; Fabiano, Silvia; Jongen, Aurélien; Guckenberger, Matthias (Translational Lung Cancer Research; Vol 10, No 4 (April 29, 2021): Translational Lung Cancer Research, 2020)