Nitrogen mustard, vincristine, procarbazine, and prednisone as adjuvant chemotherapy in the treatment of medulloblastoma. A pediatric oncology group study

J. P. Krischer, A. H. Ragab, L. Kun, T. H. Kim, J. P. Laurent, J. M. Boyett, C. J. Cornell, M. Link, A. R. Luthy, B. Camitta