GSTM1 and chronic kidney disease: Clevenger et al. investigated the effect of iron on QoL in anaemic patients without chronic kidney disease and found that these patients benefit significantly from parental iron (Hb MD = 1.04 g/dL, CI: 0.52, 1.57, n = 1744), but oral application (Hb MD: 0.91 g/dL, CI: 0.48, 1.35, n = 851) did not lead to a significant difference in QoL.