| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Atypon | https://www.ajph.org/doi/10.2105/ajph.56.6.884?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed | |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/5949317/ |