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Predialysis β2M levels from baseline in two groups of patients using a crossover design. Treatment in group A (●) was started with high-flux polyamide membrane (Polyflux 14S; solid line); in group B (○), low-flux polyamide membrane (Polyflux 6L; dashed line) was used initially. *P < 0.0001 between groups. Data are means ± SEM.
