Relevance sorting gives a higher placement for
articles with a high search term frequency, a high number
of different search terms, rare search terms, short
article or search field length (e.g. abstract or title
field), and a recent publication date.
Most recently added displays articles in the order
they were added to Europe PMC, so new articles are at the
top of the list. Saved alerts use this sort order.
Times cited display the most cited articles first.
Date published displays the most recently published
articles first, and can be reversed.