Inclusion of children with airway disease for the development of spirometry reference data.

Hüls A IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany Anke.Huels@IUF-Duesseldorf.de.
Krämer U IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany.
Schuster A Heinrich-Heine University, University Children's Hospital, Düsseldorf, Germany.
Gappa M Marien Hospital Wesel, Children's Hospital and Research Institute, Wesel, Germany.
Wisbauer M Heinrich-Heine University, University Children's Hospital, Düsseldorf, Germany.
Müller-Brandes C Dept of Anaesthesiology and Intensive Care Medicine, Medical School of Hanover, Hanover, Germany.
Schikowski T IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany Swiss Tropical and Public Health Institute, Basel, University of Basel, Basel, Switzerland.
Hoffmann B IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany Medical Faculty, Deanery of Medicine, Heinrich-Heine University of Düsseldorf, Düsseldorf, Germany.
von Berg A Marien Hospital Wesel, Children's Hospital and Research Institute, Wesel, Germany.
Berdel D Marien Hospital Wesel, Children's Hospital and Research Institute, Wesel, Germany.