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On demand use of β2 agonists led to better asthma control than regular use in moderate to severe asthma

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  • Source of funding: no external funding.

  • For correspondence: Dr B Richter, Heinrich-Heine-Universität Düsseldorf, Klinik für Stoffwech-selkrankheiten und Ernährung, Moorenstrasse 5, Postfach 101007, D-40001 Düsseldorf, Germany. richterb{at}

  • A modified version of this abstract also appears in Evidence-Based Nursing.

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