Relationships between vascular/plasma biopterins and endothelial nitric oxide synthase coupling, endothelial function and inflammation, in human atherosclerosis by Antoniades, C, Shirodaria, C, Leeson, P, Crabtree, M, Pillai, R, Ratnatunga, C, Tousoulis, D, Antonopoulos, A, Stetanadis, C, Channon, K