– PubMed
“PubMed comprises more than 28 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.”
https://www.ncbi.nlm.nih.gov/pubmed/
– Finding articles
http://www.nursingdegree.net/blog/25/25-search-engines-every-medical-professional-should-bookmark/
https://www.emergingedtech.com/2013/12/top-11-trusted-and-free-search-engines-for-scientific-and-academic-research/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2755828/
– Tools for researchers
http://connectedresearchers.com/online-tools-for-researchers/