Frelinger AL, Michelson AD, Wiviott SD, Trenk D, Neumann FJ, Miller DL, Jakubowski JA, Costigan TM, McCabe CH, Antman EM, Braunwald E. Intrinsic platelet reactivity before P2Y12 blockade contributes to residual platelet reactivity despite high-level P2Y12 blockade by prasugrel or high-dose clopidogrel. Results from PRINCIPLE-TIMI 44. Thromb Haemost. 2011 Aug; 106(2):219-26.