Are spacers of any use in the treatment of asthma?
D000305:Adrenal Cortex Hormones / Q000008:administration & dosage; D000336:Aerosols; D001249:Asthma / Q000188:drug therapy*; D001507:Beclomethasone / Q000008:administration & dosage; D006801:Humans; D012138:Respiratory Therapy / Q000295:instrumentation*
D000305:Adrenal Cortex Hormones; D000336:Aerosols; D001507:Beclomethasone