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A 4-year-old boy is brought to the emergency department with intense crying and pain in both hands after playing with ice cubes. His mother denies any preceding trauma. The temperature is 37.0°C (98.6°F), the blood pressure is 90/55 mm Hg, and the pulse is 100/min. The physical examination shows swollen dorsa of the hands and scleral icterus. The laboratory tests show hemoglobin of 10.1 g/dL and unconjugated hyperbilirubinemia. The cellulose acetate electrophoresis shows 60% HbS and absence of HbA. Which of the following can reduce the recurrence of the patient’s current condition?