| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=16988600.ui | |
| subscription/membership/fee required | Wolters Kluwer | https://doi.org/10.1097/01.ijg.0000212256.25573.44 |