INTRAGO: intraoperative radiotherapy in glioblastoma multiforme; a phase I/II dose escalation study - Giordano, Frank Anton; Schmiedek, Peter; Wenz, Frederik; Brehmer, Stefanie; Abo-Madyan, Yasser; Welzel, Grit; Sperk, Elena; Keller, Anke; Schneider, Frank; Clausen, Sven; Herskind, Carsten (BMC cancer, 2014)