Spacer design.
Cronin
S
S
D001249:Asthma / Q000188:drug therapy; D001993:Bronchodilator Agents / Q000008:administration & dosage; D002648:Child; D004205:Cromolyn Sodium / Q000008:administration & dosage; D004867:Equipment Design; D006801:Humans; D009330:Nebulizers and Vaporizers
D001993:Bronchodilator Agents; D004205:Cromolyn Sodium