Platelet adhesion enhances the glycoprotein VI-dependent procoagulant response. Involvement of p38 MAP kinase and calpain - Siljander, P; Farndale, RW; Feijge, MAH; Comfurius, P; Kos, S; Bevers, EM; Heemskerk, JWM (Arterioscler Thromb Vasc Biol, 2001)