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Evolution of AAA diameter (a) and enlargement rate (b) from an initially hypertensive aorta. Solid lines represent enlargement for constant collagen material properties; dashed lines represent enlargement during collagen stiffening; dash-dotted lines represent enlargement of normotensive aneurysm with constant collagen properties; dotted lines represent enlargement of normotensive aneurysm with collagen stiffening. ‘x’ denotes expected rupture.
