Maintenance: On Thursday, June 28 2018, 18:00-18:15, maintenance work on the ZORA servers is scheduled. ZORA will not be available during this period. Thank you for your patience.
Strassmann, R; Bausch, B; Spaar, A; Kleijnen, J; Braendli, O; Puhan, M A (2009). Smoking cessation interventions in COPD: a network meta-analysis of randomised trials. European Respiratory Journal, 34(3):634-640.