Name	Info	Provider	Link
	free resource	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S2211-9132(12)00738-3
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/26889428/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/26889428
	free resource	Inforang	http://www.krcp-ksn.org/journal/view.html?doi=10.1016/j.krcp.2012.09.003
	free resource	M2PI	https://doi.org/10.1016/j.krcp.2012.09.003