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E-Cigarettes	free resource	MedlinePlus Health Information	https://medlineplus.gov/ecigarettes.html
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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29053025/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29053025
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-MPO-1
	free resource	scite Smart Citations	https://scite.ai/reports/29053025