Name	Info	Provider	Link
	free resource	Baishideng Publishing Group Inc.	https://www.wjgnet.com/2218-4333/full/v3/i4/63.htm
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22574289/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/22574289