Explaining the unexpected: insights from the PLATelet inhibition and clinical Outcomes (PLATO) trial comparing ticagrelor and clopidogrel. Editorial on Serebruany “Viewpoint: Paradoxical excess mortality in the PLATO trial should be independently verified” (Thromb Haemost 2011; 105.5) - Ohman, EM; Roe, MT. (Thromb Haemost, 2011)