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APA Citation
Rayner, R. J., Tyrrell, J. C., Hiller, E. J., Marenah, C., Neugebauer, M. A., Vernon, S. A., & Brimlow, G. (1989). night blindness and conjunctival xerosis caused by vitamin A deficiency in patients with cystic fibrosis.. Archives of disease in childhood, 64(8), 1151–1156. http://access.bl.uk/ark:/81055/vdc_100144483033.0x000057