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APA Citation
Vogel, M., Benson, L. N., Burrows, P., Smallhorn, J. F., & Freedom, R. M. (1989). balloon dilatation of congenital aortic valve stenosis in infants and children: short term and intermediate results.. Heart, 62(2), 148–153. http://access.bl.uk/ark:/81055/vdc_100142950539.0x000037