| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ediciones Doyma, S.L. | http://linkinghub.elsevier.com/retrieve/pii/S1575-0922(11)00038-6 | |
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S1575-0922(11)00038-6 | |
| Breathing Problems | free resource | MedlinePlus Health Information | https://medlineplus.gov/breathingproblems.html |