1. Increases in deaths from asthma.;Sly;Ann Allergy,1984
2. A recent increase in asthma mortality in the northwestern United States.;Paulozzi;Ann Allergy,1986
3. Mortality Statistics Branch, National Center for Health Statistics. Obtained through the courtesy of John W. Kusek.
4. Theophylline use: An overview.;Weinberger;J Allergy Clin Immunol,1985
5. International Classification of Disease.,1980