Risk-adapted Combined-modality Therapy with VAMP/COP and Response-based Involved-field Radiation for Unfavorable Pediatric Hodgkin's Disease Journal of Clinical Oncology Hudson MM, Krasin M, Link MP, Donaldson SS, Billups C, Merchant TE, Kun L, Billey AL, Kaste S, Tarbell NJ, Howard S, Friedman AM, Hurwitz CA, Young JA, Marcus KC, Rai S, Cowen T, Weinstein HJ 2004; 22: 4541-4550