TY  - BOOK
TI  - Methods for cohort studies of chronic airflow limitation
SN  - 9289011033
U1  - 614.4028 
PY  - 1982///
CY  - Copenhagen
PB  - WHO
KW  - EPIDEMIOLOGICAL STUDIES
KW  - Cohort studies
KW  - Chronic Airflow Limitation
ER  -