The chart below shows the 5 most frequently published subjects of a given time period. The time periods — All Time, Last Year, Last 5 years, or Last 10 years — are accessible using the tabs above. The chart shows the trend for those 12 subjects over time. The x axis is year, and the y axis is an arbitrary unit of topic frequency normalized by the total number of articles in PubMed/MEDLINE.

Articles with at least one author from Harvard or its affiliated institutions are included in Harvard Medvane.