Residential green space and medication sales for childhood asthma: A longitudinal ecological study in Belgium, Aerts, Raf, Dujardin Sébastien, Nemery Benoit, Van Nieuwenhuyse An, Van Orshoven Jos, Aerts Jean-Marie, Somers Ben, Hendrickx Marijke, Bruffaerts Nicolas, Bauwelinck Mariska, et al. , Environmental Research, Jan-10-2020, Volume 189, (2020)