TY  - GEN
AU  - Blais,L
AU  - Ernst,P
AU  - Suissa,S
TI  - Confounding by indication and channeling over time: the risks of beta 2-agonists
SN  - 0002-9262
PY  - 1997///0107
KW  - Administration, Inhalation
KW  - Adolescent
KW  - Adrenergic beta-Agonists
KW  - adverse effects
KW  - Adult
KW  - Albuterol
KW  - Asthma
KW  - drug therapy
KW  - Child
KW  - Cohort Studies
KW  - Confounding Factors, Epidemiologic
KW  - Epidemiologic Methods
KW  - Fenoterol
KW  - Humans
KW  - Longitudinal Studies
KW  - Middle Aged
KW  - Risk Factors
KW  - Severity of Illness Index
N1  - Publication Type: Journal Article; Research Support, Non-U.S. Gov't
UR  - https://doi.org/10.1093/oxfordjournals.aje.a008895
ER  -