TY - STAND AU - M. Frisher AU - H. Heatlie AU - S. Chapman AU - J. Bashford AU - J. Norwood BT - Journal of Applied Therapeutic Research PY - 1999 SP - 253 EP - 259 T2 - Journal of Applied Therapeutic Research TI - Switching between metered dose inhalers (MDIs) and dry powder inhalers (DPIs) in airways disease: An analysis of agespecific rates using the general practice research database. VL - 2 ER -