@article {15, editor = {,}, title = {On demand use of β2 agonists led to better asthma control than regular use in moderate to severe asthma}, volume = {6}, number = {1}, pages = {15--15}, year = {2001}, doi = {10.1136/ebm.6.1.15}, publisher = {Royal Society of Medicine}, issn = {1356-5524}, URL = {https://ebm.bmj.com/content/6/1/15}, eprint = {https://ebm.bmj.com/content/6/1/15.full.pdf}, journal = {BMJ Evidence-Based Medicine} }