TY  - RPRT
TI  - Additional factors in chronic bronchitis.
AU  - K J Cullen
AU  - J Elder
AU  - A R Adams
AU  - N S Stenhouse
PY  - 1970
DO  - 10.1136/bmj.1.5693.394
UR  - https://pubmed.ncbi.nlm.nih.gov/5434657/
ID  - 5434657
ER  -