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APA Citation
Sullivan, I. D., Wren, C., Bain, H., Hunter, S., Rees, P. G., Taylor, J. F., Bull, C., & Deanfield, J. E. (1989). balloon dilatation of the aortic valve for congenital aortic stenosis in childhood.. Heart, 61(2), 186–191. http://access.bl.uk/ark:/81055/vdc_100143573507.0x000038