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MEDLINE citation count. This figure shows the enormous increase in the citation count at MEDLINE over the last six decades. The year 2015s count is not complete but in progress. The graphed statistics are taken from the official website of the MEDLINE by the US national Library of Medicine (http://www.nlm.nih.gov/bsd/medline_cit_counts_yr_pub.html), attached in supplementary material.
