Q. A 10-year-old Nigerian boy is brought to the clinic because of continuous mild jaundice and fatigue. He migrated to the US with his parents 6 months ago. The father mentions that their family has several cases like this. A hereditary disease that causes decreased ATP levels in RBC is confirmed by cytogenetic studies. Splenomegaly and pale conjunctiva with scleral icterus are noticed on clinical examination. What is the most likely diagnosis?