Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19949607/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/19949607
	free resource	The Korean Society of Cardiology	https://e-kcj.org/DOIx.php?id=10.4070/kcj.2009.39.4.168