1. Increased rates of illness and death from asthma in Canada;Mao;Can Med Assoc J,1987
2. Increase in deaths from asthma;Sly;Ann Allergy,1984
3. A recent increase in asthma mortality in the northwestern United States;Paulozzi;Ann Allergy,1986
4. International trends in asthma mortality: 1970 to 1985;Jackson;Chest,1988
5. Asthma mortality in England and Wales: evidence for a further increase, 1974-84;Burney;Lancet,1986