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Medical Journal Impact Factors PDF download: Journal impact factors – Springer Link www.ncbi.nlm.nih.gov Three other core metrics of scientific journals are the imme- diacy index, cited half -life, and citing half-life. The immediacy. Toxicology Reviews. Journal Impact Factors, h Indices, and Citation. Analyses in Toxicology. Steven B. Bird, MD. University of Massachusetts Medical School, Department