Measuring the effectiveness of inhaled corticosteroids for COPD is not easy!
- PMID: 12826590
- DOI: 10.1164/rccm.2304004
Measuring the effectiveness of inhaled corticosteroids for COPD is not easy!
Comment on
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Effectiveness of inhaled corticosteroids in chronic obstructive pulmonary disease: immortal time bias in observational studies.Am J Respir Crit Care Med. 2003 Jul 1;168(1):49-53. doi: 10.1164/rccm.200210-1231OC. Epub 2003 Mar 27. Am J Respir Crit Care Med. 2003. PMID: 12663327
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