Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30775352/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/30775352
	free resource	The Korean Vaccine Society	https://ecevr.org/DOIx.php?id=10.7774/cevr.2019.8.1.64