| Name | Info | Provider | Link |
|---|---|---|---|
| COVID-19 (Coronavirus Disease 2019) | free resource | MedlinePlus Health Information | https://medlineplus.gov/covid19coronavirusdisease2019.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33640954/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/33640954 | |
| subscription/membership/fee required | Silverchair Information Systems | https://academic.oup.com/bjs/article-lookup/doi/10.1093/bjs/znaa024 |