Correlation of peripheral blood CD34-positive cells with creatine kinase MB, N-terminal pro-B-type natriuretic peptide, and left ventricular ejection fraction in patients with acute myocardial infarction Chinese Journal of Tissue Engineering Research . 2011, (23): 4355 -4358 .  DOI: 10.3969/j.issn.1673-8225.2011.23.040