Name	Info	Provider	Link
	free resource	Korean Academy of Medical Sciences	https://jkms.org/DOIx.php?id=10.3346/jkms.2011.26.3.386
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21394307/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21394307