TY  - RPRT
TI  - Comment: metered-dose inhalers.
AU  - D M Williams
AU  - R A Pleasants
PY  - 1989
DO  - 10.1177/106002808902301025
UR  - https://pubmed.ncbi.nlm.nih.gov/2815863/
ID  - 2815863
ER  -