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Methodological quality summary: review authors' judgements about each methodological quality item for each included study.*
*For multi‐arm studies (Barlas 1998, Kuyucu 2004 and Plint 2009), we included one overall assessment for all trial comparisons, and two assessments for each separate comparison of glucocorticoids versus placebo (with or without protocolised bronchodilator, or with epinephrine or salbutamol).
