| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/MDOI-RPC-12-2005-61-6-0761-8417-101019-200517289 | |
| COPD | free resource | MedlinePlus Health Information | https://medlineplus.gov/copd.html |
| subscription/membership/fee required | Masson (France) | http://www.em-consulte.com/retrieve/pii/MDOI-RPC-12-2005-61-6-0761-8417-101019-200517289 |