| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | S. Karger AG, Basel, Switzerland | https://doi.org/10.1159/000321222 | |
| Secondhand Smoke | free resource | MedlinePlus Health Information | https://medlineplus.gov/secondhandsmoke.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21051869.ui | |
| Asthma | free resource | MedlinePlus Consumer Health Information | https://medlineplus.gov/asthma.html |