| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | S. Karger AG, Basel, Switzerland | https://doi.org/10.1159/000284683 | |
| Opioids and Opioid Use Disorder (OUD) | free resource | MedlinePlus Health Information | https://medlineplus.gov/opioidsandopioidusedisorderoud.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20160444/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/20160444 |