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APA Citation
Semple, T., Snow, T., Duncan, A., Barker, S., Rubens, M., Mario, C. D., Davies, S. W., Moat, N., & Nicol, E. (n.d.). 11 Ascending aortic calcification – defining the porcelain aorta. Heart, 103, A4. http://access.bl.uk/ark:/81055/vdc_100135126430.0x000015