| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | S. Karger AG, Basel, Switzerland | https://doi.org/10.1159/000527361 | |
| COVID-19 (Coronavirus Disease 2019) | free resource | MedlinePlus Health Information | https://medlineplus.gov/covid19coronavirusdisease2019.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=36310021.ui |