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American Academy of Asthma, Allergy & Immunology: "Asthma" and "Allergy and Asthma Drug Guide."
National Jewish Medical and Research Center: "Inhaled Medication with a Metered Dose Inhaler (MDI)."
Asthma Society of Canada: "How to Use Your Inhaler."
Science Daily: "New Asthma Inhaler Propellant Effective, but Costlier."
Children's Hospital Boston: "Allergy Treatment."
Boehringer Ingelheim: "US FDA Expands Approval of Tiotropium Respimat® for Maintenance Treatment of Asthma in Children."
FDA. Prescribing Information: Spiriva Respimat.