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Biases in the observational study of β blockers in COPD
- Dr S Suissa, Center for Clinical Epidemiology, Jewish General Hospital, 3755 Côte-Sainte-Catherine Road, Montréal, Québec, Canada H3T 1E2; samy.suissa{at}mcgill.ca
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Biases in the observational study of β blockers in COPD
Publication history
- Accepted June 29, 2008
- First published November 4, 2008.
Online issue publication
November 04, 2008
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2008 BMJ Publishing Group and British Thoracic Society