| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S0398-0499(11)00289-7 | |
| Birthmarks | free resource | MedlinePlus Health Information | https://medlineplus.gov/birthmarks.html |
| subscription/membership/fee required | Masson (France) | http://www.em-consulte.com/retrieve/pii/S0398-0499(11)00289-7 |