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Elhadad, D., Simon, A.J., Bronstein, Y. et al. Presence of “ACKR1/DARC null” polymorphism in Arabs from Jisr az-Zarqa with benign ethnic neutropenia. Pediatr Res 91, 1012–1014 (2022). https://doi.org/10.1038/s41390-021-01623-2