The impact of age and gender on biology, clinical features and treatment outcome of non-Hodgkin lymphoma in childhood and adolescence. - Burkhardt, Birgit; Zimmermann, Martin; Oschlies, Ilske; Niggli, Felix; Mann, Georg; Parwaresch, Reza; Riehm, Hansjoerg; Schrappe, Martin; Reiter, Alfred (British Journal of Haematology, 2005)