Letter: Propellant a factor in asthma deaths.
D000335:Aerosol Propellants / Q000009:adverse effects; D000336:Aerosols / Q000009:adverse effects*; D001249:Asthma / Q000188:drug therapy* / Q000401:mortality; D006801:Humans
D000335:Aerosol Propellants; D000336:Aerosols