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Histopathological grading of pediatric ependymoma: reproducibility and clinical relevance in European trial cohorts

David W Ellison*, Mehmet Kocak, Dominique Figarella-Branger, Giangaspero Felice, Godfraind Catherine, Torsten Pietsch, Didier Frappaz, Maura Massimino, Jacques Grill, James M Boyett and Richard G Grundy

Journal of Negative Results in BioMedicine 2011, 10:7  doi:10.1186/1477-5751-10-7