Chronic treatment with tetrahydrobiopterin reverses endothelial dysfunction and oxidative stress in hypercholesterolaemia. - Cosentino, F; Hürlimann, D; Delli Gatti, C; Chenevard, R; Blau, N; Alp, N; Channon, K; Eto, M; Lerch, P; Enseleit, F; Ruschitzka, F; Volpe, M; et al. (Heart (British Cardiac Society), 2008)