Covidence will detect duplicate citations both within the file being uploaded as well as against all previous imports.
It checks on the following fields:
The titles must match exactly after basic normalisation, ignoring punctuation and special characters, but maintaining Unicode.
Where there is a non-English character, there is no conversion.
For example, the citation:
Dabigatran-related coagulopathy: When can we assume the effect has "worn off"?
Would be normalised to:
As would the citation:
Dabigatran related coagulopathy (When can we assume the effect has worn-off?)
Meaning that it would be detected as a duplicate.
However, the citation:
Would not be detected as a duplicate.
The four digit field for year must match exactly.
The volume must match exactly, ignoring special characters, such as brackets.
The authors must be sufficiently similar in order to be detected as a duplicate. They do not have to be exact matches.