| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | American Academy of Family Physicians | https://www.aafp.org/link_out?pmid=22963030 | |
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/p1171 | |
| subscription/membership/fee required | ClinicalKey | https://www.clinicalkey.com/content/playBy?issn=0002-838X&vol=86&issue=4&pgfirst=1 |