| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=31365369.ui | |
| free resource | Silverchair Information Systems | https://pubs.asahq.org/anesthesiology/article-lookup/doi/10.1097/ALN.0000000000002827 |