Noninvasive determination of endothelium-mediated vasodilation as a screening test for coronary artery disease: pilot study to assess the predictive value in comparison with angina pectoris, exercise electrocardiography, and myocardial perfusion imaging. - Schroeder,S.; Enderle,M.D.; Ossen,R.; Meisner,C.; Baumbach,A.; Pfohl,M.; Herdeg,C.; Oberhoff,M.; Haering,H.U.; Karsch,K.R. (Am Heart J, 1999)