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Abstract Background The porphyrias are a group of rare, mainly inherited metabolic disorders that result from decreased or, in one rare form of erythropoietic protoporphyria, increased, activities of the enzymes of heme biosynthesis. Each porphyria is defined by the association…
Abstract Background There are many sources of variation in numerical results generated by examinations performed in laboratory medicine. Some measurands have biological variations over the span of life and others have predictable cyclical or seasonal variations. Most measurands in an…