The Journal of asthma : official journal of the Association for the Care of Asthma
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Time trends in the number of publications of randomized controlled trials (RCTs) in asthma research have never been evaluated. ⋯ Despite an increase in total publications of asthma research, time trends in the number of publications of RCTs in asthma research per year show an almost unchanged number in the period 1990-2009. Evidence-based medicine within the field of asthma still faces many challenges.