Roberts WC, Ko JM. Frequency by decades of unicuspid, bicuspid, and tricuspid aortic valves in adults having isolated aortic valve replacement for aortic stenosis, with or without associated aortic regurgitation. Circulation. 2005 Feb 22;111(7):920-5. PMID: 15710758
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Table 1 (p. 921) breaks down surgical procedures by gender and age at time of operation.
