Name Info Provider Link
free resource BioMed Central https://bmcpublichealth.biomedcentral.com/articles/10.1186/1471-2458-8-S1-S2
Smoking and Youth free resource MedlinePlus Health Information https://medlineplus.gov/smokingandyouth.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19091045/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/19091045