Letter: Letter to the editor.
D001249:Asthma / Q000188:drug therapy*; D002087:Butyrates / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D006801:Humans; D008875:Middle Aged; D010366:Peak Expiratory Flow Rate; D013726:Terbutaline / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D013997:Time Factors
D002087:Butyrates; D013726:Terbutaline