| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | BioMed Central | https://bmccomplementalternmed.biomedcentral.com/articles/10.1186/s12906-019-2639-9 | |
| COPD | free resource | MedlinePlus Health Information | https://medlineplus.gov/copd.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31484521/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/31484521 |