1. JAMA.
2. New England Journal of Medicine.
3. New Zealand Medical Journal.
4. Norwegian Medical Journal.
5. CMAJ.
6. The Lancet.
7. MEDLINE.
8. Annals of Internal Medicine.
9. Croatian Medical Journal.
10. Nederlands Tijdschrift voor Geneeskunde.
11. Journal of the Danish Medical Association.
12. The Medical Journal of Australia.