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Background: The concentration of exhaled carbon monoxide (eCO) in young children with stable asthma and during acute asthma attack is not known.
Methods: A sampling bag was developed to collect the exhaled air of preschool children. A total of 257 preschool‐age children (≥3 years and ≤6 years old) were studied; 111 had a diagnosis of asthma (43 suffering a mild asthma attack and 68 without active...
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