Standard- vs high-dose clopidogrel based on platelet function testing after percutaneous coronary intervention: the GRAVITAS randomized trial. - Price MJ; Berger PB; Teirstein PS; Tanguay JF; Angiolillo DJ; Spriggs D; Puri S; Robbins M; Garratt KN; Bertrand OF; Stillablower ME; Aragon JR; et al. (JAMA: Journal of the American Medical Association, 2011)