Pretreatment factors predict overall survival for patients with low-grade glioma: a recursive partitioning analysis. - Bauman,G.; Lote,K.; Larson,D.; Stalpers,L.; Leighton,C.; Fisher,B.; Wara,W.; MacDonald,D.; Stitt,L.; Cairncross,J.G. (Int J Radiat Oncol Biol Phys, 1999)