Mycophenolate mofetil Recruiting Phase 2 Trials for Refractory Anemia With Ring Sideroblasts / Chronic Myelomonocytic Leukemia / Aplastic Anaemia (AA) / Myelodysplastic Syndrome / Refractory Anemia / Lymphoma, Hodgkins / Plasma Cell Myeloma / Neoplasms, Malignant / Leukemia Acute Myeloid Leukemia (AML) / Acute myeloid leukaemia (in remission) / Myeloproliferative Neoplasms / Refractory Cytopenia With Multilineage Dysplasia / Refractory Cytopenia With Multilineage Dysplasia and Ring Sideroblasts / Indolent Non-Hodgkin's Lymphomas / Refractory Anemia With Excess Blasts Treatment