Rik J B Loymans general practitioner, Armin Gemperli assistant professor, Judith Cohen general practitioner, Sidney M Rubinstein senior researcher, Peter J Sterk professor, Helen K Reddel research leader et al
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Comparative effectiveness of long term drug treatment strategies to prevent asthma exacerbations: network meta-analysis
BMJ 2014; 348 :g3009
doi:10.1136/bmj.g3009