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There are conflicting views on time trends of asthma and atopy during the last 10-15 years. Additional confusion is caused by the term of asthma which is a unifying name for different phenotypes. Asthma has been a topic for investigation to the Swiss Sentinel Surveillance Network (SSSN) since 1989. The objective of the actual study was to determine the influence of the allergic and non-allergic components of asthma on time trends from 1999 to 2005.

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Is the ebb of asthma due to the decline of allergic asthma? A prospective consultation-based study by the Swiss Sentinel Surveillance Network, 1999-2005