Name	Info	Provider	Link
	free resource	J-STAGE, Japan Science and Technology Information Aggregator, Electronic	https://doi.org/10.2185/jrm.2020-010
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33033532/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33033532
	subscription/membership/fee required	Medical Online, Meteo Inc	https://www.medicalonline.jp/meteo_linkout.php?issn=1880-487X&volume=15&issue=4&spage=132