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Effects of leukotriene receptor antagonist (LTRA) treatment on duration (upper) and severity (lower) of acute asthma exacerbation. Among all patients with acute asthma exacerbations irrespective of upper respiratory tract infection (URI; n = 53), the duration and incidences of mild and moderate exacerbations are compared between the LTRA+ and LTRA− groups. Bars represent means ± SD in the upper part and numbers of subjects in the lower part.
