Stereotactic body radiotherapy for single and multiple early-stage non-small cell lung cancer in patients aged ≥ 80 years. - Vorbach, Samuel M.; Seppi, Thomas; Peeken, Jan C.; Sarcletti, Manuel; Pointner, Martin; Hörmandinger, Katharina; Mangesius, Julian; Nevinny-Stickel, Meinhard; Ganswindt, Ute (Radiation Oncology, 2025)