Erythrityl tetranitrate Completed Phase 2 Trials for Recurrent Childhood Small Noncleaved Cell Lymphoma / Secondary Myelodysplastic Syndromes / Childhood Acute Lymphoblastic Leukemia in Remission / Recurrent Childhood Acute Lymphoblastic Leukemia / Childhood Chronic Myelogenous Leukemia / Previously Treated Myelodysplastic Syndromes / Juvenile Myelomonocytic Leukemia / Recurrent Childhood Large Cell Lymphoma / Recurrent Neuroblastoma / Previously Treated Childhood Rhabdomyosarcoma / Recurrent Childhood Acute Myeloid Leukemia / Recurrent/Refractory Childhood Hodgkin Lymphoma / Recurrent Childhood Lymphoblastic Lymphoma / Pulmonary Complications / Accelerated Phase Chronic Myelogenous Leukemia / Childhood Acute Myeloid Leukemia in Remission / Recurrent Childhood Rhabdomyosarcoma / Relapsing Chronic Myelogenous Leukemia / Disseminated Neuroblastoma / Chronic Phase Chronic Myelogenous Leukemia / Blastic Phase Chronic Myelogenous Leukemia / Secondary Acute Myeloid Leukemia (Secondary AML, sAML) / De Novo Myelodysplastic Syndromes / Recurrent Wilms Tumor and Other Childhood Kidney Tumors / Childhood Myelodysplastic Syndromes Treatment