| Name | Info | Provider | Link |
|---|---|---|---|
| COVID-19 (Coronavirus Disease 2019) | free resource | MedlinePlus Health Information | https://medlineplus.gov/covid19coronavirusdisease2019.html |
| free resource | Nature Publishing Group | https://doi.org/10.1038/s41598-021-98919-4 | |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34650101/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/34650101 |