RT Journal Article SR Electronic T1 Metered-Dose Inhalers and Dry Powder Inhalers in Aerosol Therapy JF Respiratory Care FD American Association for Respiratory Care SP 1138 OP 1138 VO 50 IS 9 A1 Rajiv Dhand A1 Neil R MacIntyre YR 2005 UL http://rc.rcjournal.com/content/50/9/1138.abstract AB