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bioRxiv
BMJ Learning
Dimensions
Free Medical Journals
Google Scholar
De Gruyter
HighWire Press
Hikari journals (International Publishers of Science, Technology and Medicine)
HINARI (The Health InterNetwork Access to Research Initiative)
IOPscience
Karger Publishers Open Access Content
Open Ukrainian Citation Index (OUCI)
Oxford Academic
PLoS Journals (Public Library of Science Journals)
PubMed Central
SAGE-Hindawi Access to Research
Scientific Research Publishing (SCIRP)
Scopus
Springer eBooks 2017
Web of Science
Wiley Open Access
