| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | S. Karger AG, Basel, Switzerland | https://doi.org/10.1159/000521999 | |
| 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/35172298/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/35172298 |