| Name | Info | Provider | Link |
|---|---|---|---|
| Arrhythmia | free resource | MedlinePlus Health Information | https://medlineplus.gov/arrhythmia.html |
| subscription/membership/fee required | Sunmedia PierOnline | http://www.pieronline.jp/openurl?issn=0021-5252&volume=65&issue=8&spage=687 |