1 Department of Thoracic Medicine, The Prince Charles Hospital; and the Queensland Children's Medical Research Institute, Brisbane, Australia; Department of Pulmonology, Haga Teaching Hospital, The Hague, The Netherlands; Cystic Fibrosis Research Group, Dept of Pediatrics I, University of Tübingen, Tübingen, Germany. Electronic address: bell@health.qld.gov.au.
2 Department of Thoracic Medicine, The Prince Charles Hospital; and the Queensland Children's Medical Research Institute, Brisbane, Australia; Department of Pulmonology, Haga Teaching Hospital, The Hague, The Netherlands; Cystic Fibrosis Research Group, Dept of Pediatrics I, University of Tübingen, Tübingen, Germany.