| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S0020-7292(05)00371-1 | |
| Biopsy | free resource | MedlinePlus Health Information | https://medlineplus.gov/biopsy.html |
| subscription/membership/fee required | Wiley | https://doi.org/10.1016/j.ijgo.2005.06.015 |