TY  - RPRT
TI  - Confounding issues in COPD risk study?
AU  - Ranjeeta Sinvhal
AU  - Lorraine Tosiello
AU  - Greg Cable
PY  - 2003
DO  - 10.1378/chest.123.1.307
UR  - https://pubmed.ncbi.nlm.nih.gov/12527640/
ID  - 12527640
ER  -