Published in State and Local Health Law Weekly, February 14th, 2008
"A sample of 6000 adults with a clinical diagnosis of asthma was extracted from a nationwide health insurance register for a postal inquiry. Comorbidity and the use of health services were measured using a questionnaire. Data on medication expenses were obtained from the national prescription register. Altogether 4956 individuals replied, of whom 3160 asthma patients...
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