Name	Info	Provider	Link
	free resource	BioMed Central	https://bmcmedresmethodol.biomedcentral.com/articles/10.1186/s12874-019-0892-8
Clinical Trials	free resource	MedlinePlus Health Information	https://medlineplus.gov/clinicaltrials.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31910813/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31910813