ALA-induced Porphyrin Accumulation in Medulloblastoma and its use for Fluorescence-Guided Surgery - Eicker, S.; Sarikaya-Seiwert, S.; Borkhardt, A.; Gierga, K.; Turowski, B.; Heiroth, H.-J.; Steiger, H.-J.; Stummer, W. (Central European Neurosurgery - Zentralblatt für Neurochirurgie, 2011)