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AGRICOLA
Biomed Central
ClinicalTrials.gov
Directory of Open Access Journals
Ebsco: Open access
Elsevier: Open access journals
Energy Citations Database
ERIC
Free Medical Journal
MedlinePlus
Microsoft Academic
National Academies Press
National Center of Comprehensive and Integrative Health
New England Journal of Medicine
Open Choice
Open Access Journals Search Engine
Project Gutenberg
Public Library of Science
Pubmed Central
SAGE Journals
SciecneDirect
Science Open
Social Science Research Network
SpringerOpen
Taylor & Francis Online
Wiley Open Access
