| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ediciones Doyma, S.L. | http://www.archbronconeumol.org/en/linksolver/ft/pii/S1579-2129(21)00232-9 | |
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S1579-2129(21)00232-9 | |
| COPD | free resource | MedlinePlus Health Information | https://medlineplus.gov/copd.html |