G6PD and malaria: malaria and normal glucose-6-phosphate dehydrogenase (G6PD) activity (ie, ≥30% of the adjusted median value for healthy male individuals), published in any language from database inception to June 8, 2023, using the terms “vivax”, “primaquine”, and “haemolysis” in MEDLINE, Web of Science, Embase, and Cochrane Central.