1. Department of General Pediatrics, University Children’s Hospital Muenster, Muenster, Germany
2. Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
3. Danish PCD Centre, ERN Accredited, Pediatric Pulmonary Service, Department of Pediatrics and Adolescent Medicine, Copenhagen University Hospital, Copenhagen, Denmark
4. Department of Pulmonary Medicine, Ruhrlandklinik, Universitätsmedizin Essen, Essen, Germany; and
5. Department of Pediatrics, HELIOS Hospital Schwerin, Schwerin, Germany