TY  - RPRT
TI  - Asthma exacerbations. 2: aetiology.
AU  - A M Singh
AU  - W W Busse
PY  - 2006
DO  - 10.1136/thx.2005.045179
UR  - https://pubmed.ncbi.nlm.nih.gov/16936237/
ID  - 16936237
ER  -