Platelet P2Y12 receptors enhance signalling towards procoagulant activity and thrombin generation. A study with healthy subjects and patients at thrombotic risk - van der Meijden, P E; Feijge, M A; Giesen, P L; Huijberts, M; van Raak, L P; Heemskerk, J W (Thromb Haemost, 2005)