title: [The use of spacing devices (spacers) attached to metered-dose inhalers in the treatment of asthma].
mesh_terms: D001249:Asthma / Q000188:drug therapy*; D001993:Bronchodilator Agents / Q000008:administration & dosage*; D006801:Humans; D009330:Nebulizers and Vaporizers
chemical_list: D001993:Bronchodilator Agents