Content Provider
Oxford University Press (via Crossref)
8
ScienceDirect (Elsevier - via Crossref)
8
Ovid
5
Oxford University Press
5
Opin vísindi (Iceland)
4
Directory of Open Access Journals: DOAJ Articles
3
Hirsla - Landspítali University Hospital research archive
2
University of California: eScholarship
2
Aarhus University: Research
1
DataCite Metadata Store (German National Library of Science and Technology)
1
ETH Zürich Research Collection
1
Frontiers (Publisher)
1
Georgetown University: DigitalGeorgetown
1
Nova Southeastern University: NSU Works
1
Ovid (via Crossref)
1
Roskilde University Research Portal (RUC)
1
Springer Nature (via Crossref)
1
University of Groningen research database
1