RT Journal Article SR Electronic T1 Smoking cessation interventions in COPD – A network meta-analysis of randomised trials JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00167708 A1 R. Strassmann A1 B. Bausch A1 A. Spaar A1 J. Kleijnen A1 O. Braendli A1 M.A. Puhan YR 2009 UL http://erj.ersjournals.com/content/early/2009/04/08/09031936.00167708.abstract AB