TY  - RPRT
TI  - COPD exacerbations .1: Epidemiology.
AU  - G C Donaldson
AU  - J A Wedzicha
PY  - 2006
DO  - 10.1136/thx.2005.041806
UR  - https://pubmed.ncbi.nlm.nih.gov/16443707/
ID  - 16443707
ER  -