Name	Info	Provider	Link
	subscription/membership/fee required	Atlantis Press	https://doi.org/10.2991/jegh.k.191023.001
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32175711/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/32175711