| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | American Academy of Family Physicians | https://www.aafp.org/link_out?pmid=34060785 | |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34060785.ui | |
| subscription/membership/fee required | ClinicalKey | https://www.clinicalkey.com/content/playBy?issn=0002-838X&vol=103&issue=11&pgfirst=693 |