Apples and oranges : flaws and guffaws.
Petty
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D000318:Adrenergic beta-Agonists / Q000008:administration & dosage*; D000420:Albuterol / Q000008:administration & dosage / Q000031:analogs & derivatives*; D001993:Bronchodilator Agents / Q000008:administration & dosage*; D018680:Cholinergic Antagonists / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D006801:Humans; D009241:Ipratropium / Q000008:administration & dosage*; D008173:Lung Diseases, Obstructive / Q000188:drug therapy*; D012107:Research Design; D000068299:Salmeterol Xinafoate; D016896:Treatment Outcome
D000318:Adrenergic beta-Agonists; D001993:Bronchodilator Agents; D018680:Cholinergic Antagonists; D000068299:Salmeterol Xinafoate; D009241:Ipratropium; D000420:Albuterol