Evaluation of particle radiotherapy for the re-irradiation of recurrent intracranial meningioma - El-Shafie, Rami; Czech, Maja; Eitz, Kerstin Anne; Habermehl, Daniel; Kronsteiner, Dorothea; Rieken, Stefan; Bougatf, Nina; Jäkel, Oliver; Debus, Jürgen; Combs, Stephanie (BioMed Central, 2018)