| Name | Info | Provider | Link |
|---|---|---|---|
| Collapsed Lung | free resource | MedlinePlus Health Information | https://medlineplus.gov/collapsedlung.html |
| subscription/membership/fee required | Sunmedia PierOnline | http://www.pieronline.jp/openurl?issn=0021-5252&volume=76&issue=10&spage=870 |