Bostel, Tilman ; Nicolay, Nils Henrik ; Welzel, Thomas ; Bruckner, Thomas ; Mattke, Matthias ; Akbaba, Sati ; Sprave, Tanja ; Debus, Jürgen ; Uhl, Matthias (2018) Sacral insufficiency fractures after high-dose carbon-ion based radiotherapy of sacral chordomas. Radiation Oncology, 13 (154). pp. 1-7. ISSN 1748-717X