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Combined effect of temperature and humidity on dried blood spot assay results. Filter cards were exposed to 20 °C or 35 °C, either at low (40–60%) or high air humidity (95%) for one month, and ADMA (a) and L-arginine (b) were measured from the dried blood spots. Data are presented as mean ± SD; * p < 0.05, ** p < 0.01 between groups; n.s.: not significant.
