| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | American Society for Clinical Investigation | https://doi.org/10.1172/JCI113854 | |
| Minerals | free resource | MedlinePlus Health Information | https://medlineplus.gov/minerals.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/2910906/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/2910906 |