TY  - RPRT
TI  - Defining asthma in epidemiological studies.
AU  - J Pekkanen
AU  - N Pearce
PY  - 1999
DO  - 10.1034/j.1399-3003.1999.14d37.x
UR  - https://pubmed.ncbi.nlm.nih.gov/10573248/
ID  - 10573248
ER  -