Name	Info	Provider	Link
	free resource	BioMed Central	https://bmcmedresmethodol.biomedcentral.com/articles/10.1186/s12874-020-00996-y
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32448147/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/32448147