| Name | Info | Provider | Link |
|---|---|---|---|
| Arsenic | free resource | MedlinePlus Health Information | https://medlineplus.gov/arsenic.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=17565158.ui | |
| subscription/membership/fee required | Silverchair Information Systems | https://academic.oup.com/jnci/article-lookup/doi/10.1093/jnci/djm004 |