| Name | Info | Provider | Link |
|---|---|---|---|
| Clinical Trials | free resource | MedlinePlus Health Information | https://medlineplus.gov/clinicaltrials.html |
| subscription/membership/fee required | Wiley | https://onlinelibrary.wiley.com/doi/10.1111/j.0006-341x.2001.00168.x | |
| subscription/membership/fee required | Silverchair Information Systems | https://academic.oup.com/biometrics/article-lookup/doi/10.1111/j.0006-341x.2001.00168.x |