Aortic diameter >or = 5.5 cm is not a good predictor of type A aortic dissection: observations from the International Registry of Acute Aortic Dissection (IRAD) - Pape, L A; Tsai, T T; Isselbacher, E M; International Registry of Acute Aortic Dissection (IRAD) Investigators (Circulation, 2007)