This article has been retracted: please see Elsevier Policy on Article Withdrawal http://www.elsevier.com/locate/withdrawalpolicy . This article has been retracted at the request of the Editor-in-Chief and the authors as it contains inaccurate data. It was found that patient data files were matched incorrectly in 33 cases to the corresponding quantitative coronary angiography results; therefore, the published data are inaccurate. As such, the manuscript should not be available for citation, and apologies are offered to readers of the journal.