Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21496438/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21496438
	free resource	Editorial Office of Chinese Journal of Lung Cancer	https://doi.org/10.3779/j.issn.1009-3419.2011.04.12