PubMed
29601058
PubMed Central
PMC5863119
DOI
10.21037/jtd.2017.12.11
PII: jtd-10-01-E83
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AND or + signifies AND operation (intersection)
OR or | signifies OR operation (union)
- negates a single word
" wraps text to signify a phrase
* at the end of a term signifies a right-side expansion
( and ) signify precedence
~N after a word signifies edit distance (fuzziness)
~N after a phrase signifies words distance