RT Journal Article SR Electronic T1 Measuring asthma control: a comparison of three classification systems JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 269 OP 276 DO 10.1183/09031936.00124009 VO 36 IS 2 A1 P.M. O’Byrne A1 H.K. Reddel A1 G. Eriksson A1 O. Östlund A1 S. Peterson A1 M.R. Sears A1 C. Jenkins A1 M. Humbert A1 R. Buhl A1 T.W. Harrison A1 S. Quirce A1 E.D. Bateman YR 2010 UL http://erj.ersjournals.com/content/36/2/269.abstract AB Markup server — Error Error There was a problem handling your request. Please try again in a few minutes, or contact us if you continue to experience this problem.