| Name | Info | Provider | Link |
|---|---|---|---|
| Vaccines | free resource | MedlinePlus Health Information | https://medlineplus.gov/vaccines.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=11421929.ui | |
| subscription/membership/fee required | Wiley | https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0105-4538&date=2001&volume=56&issue=7&spage=684 |