Chronic treatment with tetrahydrobiopterin reverses endothelial dysfunction and oxidative stress in hypercholesterolaemia. by 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, Lüscher, T, Noll, G