OC-0248: Proton Beam Therapy in childhood – First 2-years of practice results from the WPE. (April 2016) - Mazhari, A.L.; Schulze Schleithoff, S.; Guntrum, F.; Plass, C.; Stickan-Verfürth, M.; Lambert, J.; Blase, C.; Fleischhack, G.; Christiaens, M.; Timmermann, B.