High control rate in patients with chondrosarcoma of the skull base after carbon ion therapy: first report of long-term results - Uhl, Matthias; Debus, Jürgen; Mattke, Matthias; Welzel, Thomas; Oelmann-Avendano, Jan Tobias; Habl, Gregor; Jensen, Alexandra; Ellerbrock, Malte; Haberer, Thomas; Herfarth, Klaus (Cancer, 2014)