NLK
Free Medical Journals
from 2008
PubMed Central
from 2008 to 2019
Europe PubMed Central
from 2008 to 2018
ProQuest Central
from 2008-06-01 to 2021-01-31
Open Access Digital Library
from 2008-01-01
Open Access Digital Library
from 2008-01-01
Open Access Digital Library
from 2009-06-19
Nursing & Allied Health Database (ProQuest)
from 2008-06-01 to 2021-01-31
Health & Medicine (ProQuest)
from 2008-06-01 to 2021-01-31
Public Health Database (ProQuest)
from 2008-06-01 to 2021-01-31
Sciendo
from 2009-06-19
ROAD: Directory of Open Access Scholarly Resources
from 2008
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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