Filgrastim Active Not Recruiting Phase 3 Trials for Childhood Choroid Plexus Tumor / Neuroblastomas / Wilms Tumor and Other Childhood Kidney Tumors / Retinoblastoma / Sarcoma, Osteogenic / Medulloblastoma, Childhood / Unspecified Childhood Solid Tumor, Protocol Specific / Childhood Supratentorial Primitive Neuroectodermal Tumor / Childhood Pineoblastoma / Childhood Soft Tissue Sarcoma / Recurrent/Refractory Childhood Hodgkin Lymphoma Supportive Care