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Relapse-free survival curves according to induction prednisone dose in binary form (threshold 2,000 mg/m2), analyzed in each of the 4 combined risk groups based on age (cut-off 5.3 years) and serum protein (cut-off 4.2 g/dl): (A) Group 1, low-risk for both; (B) Group 2, high-risk for total proteins only; (C) Group 3, high-risk for age only; (D) Group 4, high-risk for both.
