| Name | Info | Provider | Link |
|---|---|---|---|
| Heart Surgery | free resource | MedlinePlus Health Information | https://medlineplus.gov/heartsurgery.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=17311516.ui | |
| subscription/membership/fee required | De Gruyter | https://www.degruyter.com/document/doi/10.1515/CCLM.2007.030 |