Chelation TherapyIron Chelating AgentsDeferoxamineIron OverloadChelating Agentsbeta-ThalassemiaPyridonesLead PoisoningEdetic AcidBenzoatesSuccimerIronThalassemiaBlood TransfusionFerritinsLeadTriazolesSiderosisMercury PoisoningHemosiderosisPythiosisDimercaprolLead Poisoning, Nervous System, AdultErythrocyte TransfusionSiderophoresMyelodysplastic SyndromesGastric BypassComplementary TherapiesAlbertaLiverTreatment Outcome