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APA Citation
Walker, V., Clayton, B. E., Ersser, R. S., Francis, D. E., Lilly, P., Seakins, J. W., Smith, I., & Whiteman, P. D. (1981). hyperphenylalaninaemia of various types among three-quarters of a million neonates tested in a screening programme.. Archives of disease in childhood, 56(10), 759–764. http://access.bl.uk/ark:/81055/vdc_100135549269.0x000058