Which Clinical and Biological Tumor Markers Proved Predictive in the Prospective Multicenter Trial HIT’91 - Implications for Investigating Childhood Medulloblastoma - Grotzer, M A; Hoff, K von; Bueren, A O von; Shalaby, T; Hartmann, W; Warmuth-Metz, M; Emser, A; Kortmann, R D; Kuehl, J; Pietsch, T; Rutkowski, S (Klinische Pädiatrie, 2007)