Crataegus special extract WS 1442 induces an endothelium-dependent, NO-mediated vasorelaxation via eNOS-phosphorylation at serine 1177 - Brixius, K; Willms, S; Napp, A; Tossios, P; Ladage, D; Bloch, W; Mehlhorn, U; Schwinger, R H (Cardiovasc Drugs Ther, 2006)