Cytochrome P-450 polymorphisms and response to clopidogrel - Mega, JL; Close, SL; Wiviott, SD; Shen, L; Hockett, RD; Brandt, JT; Walker, JR; Antman, EM; Macias, W; Braunwald, E; Sabatine, MS (New Engl J Med, 2009)