| Name | Info | Provider | Link |
|---|---|---|---|
| Clinical Trials | free resource | MedlinePlus Health Information | https://medlineplus.gov/clinicaltrials.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=16261271.ui | |
| subscription/membership/fee required | Springer | https://dx.doi.org/10.1007/s00246-005-1151-9 |