| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S0755-4982(10)00670-6 | |
| Breathing Problems | free resource | MedlinePlus Health Information | https://medlineplus.gov/breathingproblems.html |
| subscription/membership/fee required | Masson (France) | http://www.em-consulte.com/retrieve/pii/S0755-4982(10)00670-6 |