Outcomes of stereotactic body radiotherapy for bone oligometastases in older patients - A European multicenter cohort study. - Nägler F; Schäfer S; Seiler I; von Wachter C; Balermpas P; Loi M; Bonomo P; Slavik M; Burkon P; Kästner L; Meents J; Lohaus F; et al. (Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology, 2026)