Affiliation: | a Respiratory Division, University of Brussels (AZ VUB), Brussels, Belgiumb Department of Pharmacoepidemiology and Pharmacotherapy, Utrecht University, Utrecht, The Netherlandsc Respiratory Division, University of Liege, Belgiumd Biostatistics, University of Louvain, Brussels, Belgiume Respiratory Epidemiology Unit, McGill University, Montreal, Quebec, Canada |