| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ingenta plc | https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=28&issue=10&spage=e94&aulast=González-Gascón Y MarÃn | |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=30973352.ui | |
| subscription/membership/fee required | Wolters Kluwer | https://doi.org/10.1097/PAI.0000000000000769 |