Agreement of asthma cases and non-cases classified by self-report (current asthma), the Danish National Patient Register (DNPR) and the Register of Medicinal Product Statistics (RMPS), excluding the first three years of age from the register data.

Agreement of asthma cases and non-cases classified by self-report (current asthma), the Danish National Patient Register (DNPR) and the Register of Medicinal Product Statistics (RMPS), excluding the first three years of age from the register data.