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Event-free survival (EFS) using (a) the European Treatment and Outcome Study (EUTOS) score, (b) the Sokal score and (c) the Hasford score. There are significant differences (P = 0.009 and P < 0.001) in EFS between the risk groups according to the Sokal and Hasford scores, respectively. There is no significant difference according to the EUTOS score. NS, not significant.
