1. Pubmed:https://www.ncbi.nlm.nih.gov/pubmed
2. Web of Science:http://www.webofknowledge.com/
3. 医知网:http://www.yz365.com
4. ELSEVIER ScienceDirect:https://www.sciencedirect.com/
5. Wiley Online Library:https://onlinelibrary.wiley.com/
6. CELL:https://www.sciencedirect.com/journal/cell
7. NATURE:http://www.nature.com/
8. SCIENCE:http://www.sciencemag.org/
9. SpringerLink:https://www.springer.com/
10. Ovid:http://ovidsp.tx.ovid.com/
11. Scopus:https://www.scopus.com
12. BMJ Best Practice:https://bestpractice.bmj.com/
13. Elsevier ClinicalKey:https://www.clinicalkey.com/
14. Cochrane Library:http://www.cochranelibrary.com/
15. Embase:https://www.embase.com/
16. Oxford University Press:https://academic.oup.com/journals/
17. EBSCO:http://search.ebscohost.com/
18. Journal of Visualized Experiments(JoVE):https://www.jove.com/
19. SAGE:http://journals.sagepub.com/
20. BioMed Central:https://www.biomedcentral.com/journals
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