| Name | Info | Provider | Link |
|---|---|---|---|
| Allergy | free resource | MedlinePlus Health Information | https://medlineplus.gov/allergy.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/10807686/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/10807686 | |
| free resource | Wiley | https://doi.org/10.1038/sj.bjp.0703308 |