The Lancet. Respiratory medicine
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Review Meta Analysis
Vitamin D supplementation to prevent asthma exacerbations: a systematic review and meta-analysis of individual participant data.
A previous aggregate data meta-analysis of randomised controlled trials showed that vitamin D supplementation reduces the rate of asthma exacerbations requiring treatment with systemic corticosteroids. Whether this effect is restricted to patients with low baseline vitamin D status is unknown. ⋯ Health Technology Assessment Program, National Institute for Health Research (reference number 13/03/25).