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"Smiling" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.

A facial expression which may denote feelings of pleasure, affection, amusement, etc.

This graph shows the total number of publications written about "Smiling" by people in Harvard Catalyst Profiles by year, and whether "Smiling" was a major or minor topic of these publication.
Bar chart showing 35 publications over 19 distinct years, with a maximum of 4 publications in 2003 and 2011 and 2014 and 2015
To see the data from this visualization as text, click here.