Name	Info	Provider	Link
Secondhand Smoke	free resource	MedlinePlus Health Information	https://medlineplus.gov/secondhandsmoke.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34911607/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34911607
	free resource	Chinese Journal of Contemporary Pediatrics	http://www.zgddek.com/EN/abstract/abstract25355.shtml