There seems to be a decreasing trend in the prevalence of undiagnosed asthma in previously healthy skiers, as it decreased from 55 to 20% from 1993–2010, excluding the data from the most recent and relatively small study of 13 subjects [ 19 , 29 , 32 , 33 , 35 , 36 ].
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Asthma in Competitive Cross-Country Skiers: A Systematic Review and Meta-analysis.
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