| Name | Info | Provider | Link |
|---|---|---|---|
| Foreign Bodies | free resource | MedlinePlus Health Information | https://medlineplus.gov/foreignbodies.html |
| subscription/membership/fee required | Sunmedia PierOnline | http://www.pieronline.jp/openurl?issn=0021-5252&volume=77&issue=3&spage=217 |