| Name | Info | Provider | Link |
|---|---|---|---|
| COPD | free resource | MedlinePlus Health Information | https://medlineplus.gov/copd.html |
| free resource | Primary Care Respiratory Society UK | https://doi.org/10.4104/pcrj.2011.00031 | |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21523316/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/21523316 |