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Distribution of patients by INSS stage 1 through 3 and IDRF status into INRGSS L1 and L2 (n = 2,192 patients with INRGSS L1 or L2 tumors). IDRF, image-defined risk factor; INRGSS, International Neuroblastoma Risk Group Staging System; INSS, International Neuroblastoma Staging System.
