TY  - RPRT
TI  - What is this thing called CFA?
AU  - A U Wells
AU  - D M Hansell
AU  - A G Nicholson
PY  - 2007
DO  - 10.1136/thx.2005.051011
UR  - https://pubmed.ncbi.nlm.nih.gov/17189529/
ID  - 17189529
ER  -