| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ingenta plc | https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=139&issue=3&spage=660&aulast=Hung | |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=38386596.ui | |
| subscription/membership/fee required | Wolters Kluwer | https://doi.org/10.1213/ANE.0000000000006766 |