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[Correspondence] Corticosteroid therapy for pneumonia

We read Claudine Blum and colleagues’ study (April 18, p 1511)1 with interest. We are concerned that selection bias might have occurred during recruitment, leading to a study population with relatively mild-to-moderate community-acquired pneumonia (CAP), which might not show the true benefits and disadvantages of corticosteroid treatment and could exclude a subpopulation who might benefit greatly from corticosteroids. The investigators did not discuss the low rate of recruitment (in 4·5 years and seven tertiary hospitals only 802 [27%] of 2911 identified patients were recruited).