GSTM1 and anemia (phenotype): Findings in our registry showed that at the age of 0–6 children had severe anemia (Hb g/dl <5) with 40.2% at their first visit, which is similar to the study done at MNH using the MSC data which shows slightly increase of Haemoglobin level as age increases and that could be the cause of admission as also reported to our registry together with other factors including pain and fever (7).