Soluble CD40-ligand levels are associated with vascular superoxide production and eNOS coupling in human vessels: Interrelationships with homocysteine biosynthetic pathway - Antoniades, C; Shirodaria, C; Leeson, P; Baarholm, O; Antonopoulos, A; Pillai, R; Ratnatunga, C; Tousoulis, D; Refsum, H; Stefanadis, C; Channon, K (2008)